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  • Electronic Resource  (1,667)
  • 1980-1984  (1,667)
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  • 1981  (1,667)
  • Analytical Chemistry and Spectroscopy  (963)
  • Inorganic Chemistry  (704)
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  • Electronic Resource  (1,667)
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  • 1980-1984  (1,667)
  • 1925-1929
  • 1900-1904
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  • 101
    Electronic Resource
    Electronic Resource
    Chiral Butadienes, 91) Preparative Enrichment of Enantiomeric 2,3,4,5-Tetrabromo-2,4-hexadienes by Liquid Chromatography (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2365-2368 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chirale Butadiene, 91) Präparative Anreicherung enantiomerer 2,3,4,5-Tetrabrom-2,4-hexadiene durch Flüssigkeits-ChromatographieDie Enantiomeren des Diols 1 wurden durch Flüssigkeits-Chromatographie an Triacetylcellulose teilweise getrennt (Enantiomere Reinheiten P = 29% und 24%), während die Diether (+)- und (-)-2 mit P = 80% (Tab. 1) erhalten wurden. Ihre Schwellen der Teilrotation um die zentrale Einfachbindung wurden durch thermische Racemisierung gemessen und mit denen entsprechender Tetrachlordiene 3 und 4 verglichen (Tab. 3).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140634
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  • 102
    Electronic Resource
    Electronic Resource
    Über trimethylsilylsubstituierte 1,3-Dithietan-1,1,3,3-tetroxide (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3378-3384 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Trimethylsilyl-substituted 1,3-Dithietane 1,1,3,3-TetroxidesSubstitution reactions of 1,3-dithietane 1,1,3,3-tetroxide (1) (sulfene dimer) have been regarded as difficult. We now succeeded in the silylation of 1 by the reaction with trimethylsilyl nonafluorobutanesulfonate (2) in the presence of triethylamine yielding 2,4-bis(trimethylsilyl)-(3) and 2,2,4-tris(trimethylsilyl)-1,3-dithietane1,1,3,3-tetroxide (4) as well as - via a metallation - the four times silylated product, which has the structure 1-(tirmethylsiloxy)-2,4,4-tris(trimethylsilyl)-1,3-dithiet-1-ene 1,3,3,-trioxide (5b) and which can be considered as the first enol ether of a sulfone.
    Notes: Substitutionsreaktionen an 1,3-Dithietan-1,1,3,3-tetroxid (1) (Disulfen) galten bisher als schwierig. Es gelang nun die Silylierung von 1 mit Nonafluorbutansulfonsäure-trimethylsilylester (2) in Gegenwart von Triethylamin zu 2,4-Bis(trimethylsilyl)-(3) und 2,2,4-Tris(trimethylsilyl)1,3-dithietan-1,1,3,3-tetroxid (4) bzw. nach Metallierung zum vierfach silylierten Produkt, das als 1-(Trimethylsiloxy)-2,4,4-tris(trimethylsilyl)-1,3-dithiet-1-en-1,3,3-trioxid 5b) vorliegt und als erster Enolether eines Sulfons angesehen wurden kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141018
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  • 103
    Electronic Resource
    Electronic Resource
    Das Tetra(cyclopropyl phosphonium-Kation und das Tri 9Cyclopropyl) phosphonium-cyclopropylid (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3385-3394 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Tetra(cyclopropyl)phosphonium cation and the Tri(cyclopropyl)phosphonium CyclopropylideTertiary phosphane can not be quaternized by cyclopropyl halides. The preparation of the three possible mixed cyclopropyl/methyl phosphonium salts [CH3)n(c-C3H5)4 - nP]+X- with n = a - 3 and of the corresponding ylides (CH3)n(c-C3H5)3 - nP = CH2 with n = 0 - 2 (1 - 3) is therefore only accomplished via the cyclopropylphosphanes or through formation o the cyclopropyl ring at the phosphonium center. Quaternization of tri(cyclopropyl)phosphane with 1,3-dibromopropane followed by treatment wih base thus also allows the synthesis of the tri(cyclopropyl)phosphonium cyclopropylide (5). With acids, 5 is converted into tetra(cyclopropyl)phosphonium salts. All three ylides 1 - 3 exist as methylides, and isomerization to cyclopropylides is not observed. 2 and 3 yield ethylphosphonium salts on reaction with methyl iodide. 5 is the only cyclopropylide bearing solely aliphatic substituents. Ist unusal NMR parameters indicate an equilibrium in which the CH protons are involved in a rapid scrambling process among the tautomers. The ylides 1 - 3 and 5 are colourless liquids, thermally stable up to 200°C, and of high chemical reactivity. Reduced reactivity is encountered in the tri(cyclopropyl)phosphonium benzylide (4).
    Notes: Tertiäre Phosphane sind mit Cyclopropylhalogeniden nicht quartärisierbar. Die Darstellung der drei Möglichen (Cyclopropyl/Methyl)Phosphoniumsalze [(CH3)n(c-C3H5)4-nP]+X- mit n = 1 - 3 und der korrespondierenden Ylide (CH3)n(c-C3H5)3-nP = PH2 mit n = 0 - 2 (1 - 3) gelingt daher nur über die Cyclopropylphosphane oder über den Aufbau des Cyclopropylrests am Phosphoniumzentrum. Quartärisierung mit 1,3-Dibrompropan und nachfolgende Cyclisierung mit Basen ermöglicht so auch erstmals die Darstellung von Tri(cyclopropyl)phosphonium-cyclopropylid (5) aus Tri(cyclopropyl)phospan. Mit Säuren entstehen aus 5 Tetra(cyclopropyl)phosphoniumsalze. Die Ylide 1 - 3 liegen alle als Methylide vor und eine Isomerisierung zum cyclopropylid wird nicht beobachtet. Mit Methyliodid entstehen aus 2 und 3 die Ethylphosphoniumsalze. - 5 ist das einzige rein aliphatisch substituierte Cyclopropylid. Seine ungewöhnlichen NMR-Parameter zeigen ein Tautomerengleichgewicht an, bei dem die CH-Protonen einem raschen Austausch unterworfen sind. Die vier Ylide 1 - 3 und 5 sind farblose, bis 200°C thermisch stabile Flüssigkeiten hoher Reaktivität. Nur im Tri(cyclopropyl)phosphonium-benzylid(4) ist die Reaktionsfähigkeit deutlich gemindert.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141019
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  • 104
    Electronic Resource
    Electronic Resource
    Fast Thermal Breaking and Formation of a B-N Bond in 2-(Aminomethyl)benzeneboronates1) (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3403-3411 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Rasche thermische Öffnung und Schließung einer B-N-Bindung in 2-(Aminomethyl)benzolboronaten1)1H-, 11B- und 15N-NMR-Verschiebungen weisen darauf hin, daß die Titelverbindungen 1 - 6 (Tab. 1) eine intramolekulare B - N-Bindung ausbilden, die laut 1H- und 13C-NMR mit hoher Frequenz geöffnet (δ G c≠ = 40 bis 54 kJ/mol, Tab. 2) und wieder geschlossen wird.
    Notes: The Title compounds 1 to 6 (Table 1) are shown by 1H, 11B, and 15N NMR shifts to fom an intramolecular B - N bond which, according to 1N and 13C NMR, is frequently broken (δ G c≠ = 40 to 54 kJ/mol, Table 2) and re-formed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141021
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  • 105
    Electronic Resource
    Electronic Resource
    Synthese von 2-Amino-3, 7-(β-D-ribofuranosyl)-4H-pyrrolo[2,3-d] pyrimidin-4-on - 7-Desazaguanosin - der Stammverbindung des Nucleosids Q (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3395-3402 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 2-Amino-3, 7-dihydro-7(β-D-ribofuranosyl)-4H-pyrrolo[2,3-d]pyrimidin-one - 7-Deazaguanosine - the Parent Compound of the Nucleoside Q2-Amino-3, 7-dihydro-7-(β-D-ribofuranosyl)-4H-pyrrolo[2,3-d]pyrimidin-4-one (1a), the parent compound o e rare nucleoside Q, has been synthesized using the pyrrolo [2,3d]pyrimidine derivative 3a11) which was available by phase transfer glycosylation. N-3 alkylation of 3a with chloromethyl isopropyl ether yields 3b, which reacted in a molten mixture of sodium hydride/acetamide to give 3c. Boron trichloride in methylene chloride removes the isopropoxymethyl as well as the benzyl groups at - 78°C simultaneously with formation of 4c. After ammonolysis of 4c 7-deazaguanosine &1par;la) was obtained. IN contrast to guanosine, la shows an anomalous weak Cotton effect implying an unusual flexibility of the nucleobase around the N-glycosylic bond.
    Notes: 2-Amino-3 7,dihydro-7(β-D-ribofuranosyl)4H-pyrrolo[2,3-d]pyrimidin-4-on (1a), die Stammverbindung des seltenen Nucleosids Q, wurde aus dem durch Phasentransferglycosylierung erhaltenen Pyrrolo [2,3-d]pyrimidin-Derivat 3a11) dargestellt. N-3-Alkylierung von 3a durch Chlormethyl-isopropyl-ether führt zu 3b und Austausch der 2-Methylthiogruppe in einer NaH/Acetamid-Schmelze zum geschützten 7-Desazaguanosin 3c. Bortrichlorid im Methylenchlorid entfernt bei - 78°C sowohl den Isopropoxymethylrest als auch die Benzylschutzgruppen unter Bildung von 4c. Nach dessen Ammonolyse erhält man 7-Desazaguanosin (1a), das im Gegensatz zu Guanosin einen anomal schwachen Cotton-Effekt zeigt, der auf starke konformative Beweglichkeit der Nucleobase an der N-glycosylischen Bindung hinweist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141020
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  • 106
    Electronic Resource
    Electronic Resource
    Heterocyclische β-Enaminoester, 27. Synthese von heterokondensierten 6H-1,3-Oxazin-6-onen aus N-Acylenaminoestern im system Triphenylphosphan/Hexachlorethan/Triethylamin (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3188-3194 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocyclic β-Enamino Esters, 27 synthesis of Heterocondensed 6H-1,3-Oxazin-6-ones from N-Acylenamino Esters in the system Triphenylphosphane/Hexachloroethane/TriethylamineA simple ring closure reaction of N-acylenamino esters (1b, e,2,3a-f,7) in the system triphenyl-phosphane/hexachloroethane/triethylamine is described proceeding with high yields. Under chlorinating 3-ester cleavage heterocondensed 6H-1,3-oxazin-6-ones 4a -f, 5, 6b, e, 8, 9 are formed (UV, IR, NMR, MS).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140927
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  • 107
    Electronic Resource
    Electronic Resource
    anti-[4+4]-Dicyclopentadien (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3197-3208 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: anti-[4+4]-Dicyclopentadiene.The synthesis of anti-tricyclo[4.2.1.12,5]deca-3,7-diene(2) starting from the [4+6]-cycloadduct 4a derived from cyclopentadiene and tropon is described. Compound 2 decomposes at 200°C yielding a Mixture of cyclopentadiene (12), endo-[2+4]-dicyclopentadiene (13), anti-cis-[2+2]-dicyclopentadiene (14) and the cyclopentenyl-cyclopentadienes 15 and 16. The formation of a common diradical intermediate 11 in the decomposition of 2, 13 and 14 has been sought by means of the kinetic analyses of these reactions.
    Notes: Die Synthese des anti-tricyclo[4.2.1.12,5] deca-3,7-diens (2) aus dem [4+6]-Cycloaddukt 4a von Cyclopentadien und Tropon wird beschrieben. Bei Temperaturen um 200°C zerfällt 2 in ein Gemisch aus Cyclopentadien (12), endo-[2+4]-Dicyclopentadien (14) sowie den Cyclopentenyl-cyclopentadienen 15 und 16. Aufgrund der kinetischen Analyse dieser Reaktion sowie der Kinetik der Thermolysen von 13 und 14 wird geprüft, ob bei diesen Reaktionen ein gemeinsames Diradikal 11 durchlaufen wird.
    Additional Material: 10 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141002
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  • 108
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, CXVII1) [(Arylseleno)(diethylamino)carben]pentacarbonylchrom(0)-Komplexe (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3209-3219 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, CXVII1) [(Arylseleno)(diethylamino)carbene]pentacarbonylchromium(0)Pentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [CO)5CrCNEt2]BF4, (1) reacts with lithium arylselenolate, LiSeR, (3) [R = 4-C6H4CF3 (a), 4-C6H4Br (b) 4-C6H4F (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] with addition of the selenolate anion to the carbyne carbon atom to give [(arylseleno)(diethylamino)carbene]pentacarbonylchromium(0), (CO)5Cr[C(SeR)NEt2], (4a - g). The complexes 4 were characterized by elemental analyses, spectroscopic data and in the case fo 4d additionally by an X-ray analysis. On heating in solution, 4a - g rearrange with CO-elimination and C,Cr-migration of SeR to the corresponding trans-(arylseleno)tetracarbonyl(diethylaminocarbyne)chromium complexes, trans-RSe(CO)4-CrCNEt2, (5a - g).
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4, (1) reagiert mit Lithium -arylselenolat, LiSeR, (3) [R = 4-C6H4CF3 (a), 4-C6H4Br (b) 4-C6H4 (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] unter Addition des Selenolat-Anions an das Carbinkohlenstoffatom und Bildung von [Arylseleno)(diethylamino)carben]pentacarbonylchrom(0), (CO)5Cr[C(SeR)NEt2], (4a-g). Die Komplexe 4 wurden elementaranalytisch, spektroskopisch sowie im Fall von 4d zusätzlich durch eine Röntgenstrukturanalyse gesichert. Beim Erwärmen in Lösung lagern sich 4a-g unter CO-Abspaltung und C, Cr-Wanderung von SeR zu den entsprechenden trans-(Arylseleno)tetracarbonyl(diethylaminocarbin)chrom-Komplexen, trans-RSe(CO)4(CrCNEt2, (5a-g) um.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141003
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  • 109
    Electronic Resource
    Electronic Resource
    Bausteine von Oligosaccchariden, XXXIII1) Synthese von β-glycosidisch verknüpften L-Rhamnose-haltigen Disacchariden (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3233-3241 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Building Units for Oligosaccharides, XXXIII1) Synthesis of β-Glycosidically Linked Disaccharides of L-RhamnoseThe 2,3,4-tri-O-benzyl-α-L-rhamnopyranosyl bromide (4) is a reactive halogenose which in the presence of a silver silicate catalyst reacts with saccharides containing a reactive hydroxyl group to dive a β-glycosidically linked disaccharide with good selectivity. The three β(1 → 4) and β(1 → 3) linked disaccharides of L-rhamnose 6, 17, and 27 were made in this way with either L-rhamnose or D-galactose as hydroxyl group component. Subsequent deprotection gave the free disaccharides 8, 19 and 31 respectively.
    Notes: Das 2,34-Tri-O-benzyl-α-L-rhamnopyranosylbromid (4) ist eine reaktive Halogenose, die sich bei Gegenwart eines Silbersilicatkatalysators mit Sacchariden, die eine reaktive Hydroxylgruppe enthalten in guter Selektivität zu β-glycosidisch verknüpften Disacchariden umsetzen läßt. Die β(1 → 4)- und β(1 → 3)-verknüpften Disaccharide der L-Rhamnose 6, 17 und 27 mit L-Rhamnose und D-Galactose als Hydroxylkomponenten wurden auf diesem Wege dargestellt. Durch Entblockierung wurden die freien Disaccharide 8, 19 und 31 erhalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141005
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  • 110
    Electronic Resource
    Electronic Resource
    Theoretische Berechungen zum CO - CO-Abstoßungspotential paralleler CO-Liganden in zweikernigen Carbonylkomplexen (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3462-3466 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Theoretical Calculations of the CO - CO Repulsion Potential in Dinuclear Carbonyl ComplexesThe van der waals repulsion between CO molecules has been obtained by means of quantum mechanical ab initio calculations. The results show in a quantitative way how this interaction between parallel CO ligands on neighbouring metals counteracts bonding forces of single or double bonds between metal atoms.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141029
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  • 111
    Electronic Resource
    Electronic Resource
    Über die Synthese einiger Imino-Pentafluorsulfanyl-Derivate (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3467-3470 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Synthesis of Some Imino Pentafluorosulfanyl DerivativesFrom the reaction of SF5NSCl2 and Ag2O in nitromethane SF5NSO (1) is isolated. The also obtained 2 is probably formed form 1. In the presence of CsF 1 and Cl2 will give SF5NSOCIF (4)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141030
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  • 112
    Electronic Resource
    Electronic Resource
    Masthead (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981) 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141101
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  • 113
    Electronic Resource
    Electronic Resource
    β,β-Diacyl-enamine und -enole, 9: Zur Darstellung von Aminomethylenderivaten offenkettiger CH2-acider Verbindungen (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3471-3484 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: β,β-Diacyl-enamines and -enoles, 9: Synthesis of Aminomethylene Derivatives of Open-Chain Active Methylene CompoundsThe reaction of a combination of primary or secondary aromatic or aliphatic amines with orthocarboxylic esters upon a variety of open-chain CH2-acidic molecules gives N-substituted aminoalkylidene derivatives. The method is highly recommended for methylene compounds activated by cyano, nitro, or phenylsulfonyl groups, whereas low yields are obtained, when highly enolized active methylene compounds are used. CH2-Acidic carboxylic acids give salts 10a-g.
    Notes: Die Reaktion primärer und sekundärer aromatischer oder aliphatischer Amine mit Orthocarbonsäureestern und offenkettigen CH2-aciden Verbindungen liefert N-substituierten Aminoalkylidenderivate; die Ausbeuten variieren stark mit der Natur der aktivierenden Gruppen. Die Methode kann für solche CH2-acide Moleküle empfohlen werden, welche durch eine nichtenolisierbare Gruppe (CN, NO2 oder PhSO2) aktiviert sind, während niedrige Ausbeute oder keine Umsetzung zu erwarten ist, wenn stark enolisierte methylenaktive Verbindungen eingesetzt werden. CH2-Acide Carbonsäuren liefern die Salze 10a-g.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141102
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  • 114
    Electronic Resource
    Electronic Resource
    Phosphonium-hydrogendichloride, II: Drei Kristallstrukturen im Vergleich (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3499-3504 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphonium Hydrogendichlorides, II: Three Crystal Structures in ComparisonBy means of crystal structure analysis the compounds [(4-CH3OC6H4)(CH3)PCl2][ClHCl] (1), [(4-CH3OC6H4)PCl3][ClHCl] (2), and [(4-C2H5OC6H4)PCl3][ClHCl] (3) are confirmed as phosphonium hydrogendichlorides and the number of existing geometric parameters of hydrogen bonding between Cl atoms in crystals is substantially increased. The symmetric hydrogendichloride anions who the shortest distances Cl…Cl (312.1 pm in 2) and the largest distance of this kind (328.8 pm also in 2) is observed in the anion with the shortest Cl-H bond.
    Notes: Durch Kristallstrukturanalyse werden die Verbindungen [(4-CH3OC6H4)(CH3)PCl2][ClHCl] (1), [(4-CH3OC6H4)PCl3][ClHCl] (2) und [(4-C2H5OC6H4)PCl3][ClHCl] (3) als Phosphonium-hydrogendichloride bestätigt und die vorhandenen geometrischen Daten zur Wasserstoffbrückenbindung zwischen Cl-Atomen in Kristallen deutlich vermehrt. Die symmetrischen Hydrogendichlorid-Anionen zeigen die kürzesten Abstände Cl…Cl (312.1 pm in 2), und der längste Abstand dieser Art (328.8 pm ebenfalls in 2) wird beim Anion mit der kürzesten Bindung Cl—H beobachtet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141104
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  • 115
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    Electronic Resource
    Phosphonium-hydrogendichloride, I: Darstellung und Eigenschaften von Phosphoniumhydrogendichloriden (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3485-3498 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphonium Hydrogendichlorides, I Preparation and Properties of Phosphonium HydrogendichloridesPhosphonium hydrogendichlorides of general formula [RR′PCl2]+ [ClHCl]- (1) and [RPCl3]+ [ClHCl]- (5) as well as of the bifunctional type [P(R)Cl2—R′ — P(R)Cl2]2+ 2[ClHCl]- (6) are obtained by differnt methods as well crystallized compounds, which are extremely sensitive toward moisture. Their structures are confirmed by spectroscopic methods and conductivity measurements. - It is shown that the stability of the phosphonium ion is increased by the +M-effect of R, thus favouring the formation of [ClHCl]-. Some reactions of 1 and 5 are described. On loosing HCl, they give the corresponding Phosphoranes RR′PCl3 (3) and RPCl4 (4). This reaction is reversible. By reaction with HBr, 1 and 5 are converted into the bromophosphoranes RR′PBr3 (8) and RPBr4 (9), while phosphonium hydrogendibromides [P(R)Br2—R′—P(R)Br2]2+ 2[BrHBR]- (7) are obtained from 6.
    Notes: Phosphonium-hydrogendichloride der Zusammensetzung [RR′PCl2]+ [ClHCl]- (1) und [RPCl3]+ [ClHCl]- (5) bzw. des bifunktionellen Typs [P(R)Cl2—R′ — P(R)Cl2]2+ 2[ClHCl]- (6) erhält man als extrem hydrolyseempfindliche, gut kristallisierende Stoffe nach verschiedenen Methoden. Ihre Konstitution wird durch spektroskopische Untersuchungen und Leitfähigkeitsmessungen sichergestellt. - Es wird gezeigt, daß der +M-Effekt von R die Stabilität des Phosphonium-Ions erhöht und dadurch die Bildung von [ClHCl]- begünstigt. Einige Reaktionen von 1 und 5 werden beschrieben. So erhält man aus ihnen durch HCl-Entzug die entsprechenden Phosphorane RR′PCl3 (3) und RPCl4 (4). Diese Reaktion ist reversibel. Die Umsetzung mit HBr führt bei 1 und 5 zu den Bromphosphoranen RR′PBr3 (8) und RPBr4 (9), bei 6 hingegen zu Phosphonium-hydrogendibromiden [P(R)Br2—R′ — P(R)Br2]2+ 2[BrHBr]- (7).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141103
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    Erzeugung und Nachweis des Silaethens Me2Si=C(SiMe3)2: Thermischer Zerfall von (Me3Si)2(Me2XSi)Cli (X z. B. Hal, OR, SR) (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3505-3517 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Generation and Evidence of the Silaethene Me2Si=C(SiMe3)2: Thermolysis of (Me3Si)2(Me2XSi)CLi (X e. g. Hal, OR, SR)Thermal decomposition of Me2Xsi—CLi(SiMe3)2 (1,LiX) in deithyl ether at - 102 to 10°C leads under intramolecular LiX-elimination (X = Hal, TosO, Ph2POn, PhS) to 1,3-disilacyclobutane [Me2Si—C(SiMe3)2]2. (2). The reactive intermediate product is the silaethene Me2Si=C(SiMe3)2 (1) the intermediate formation of which has been established by the determination of reaction rates and order and also through chemical means by trapping 1 with 2, 3-dimethyl-1,3-butadiene. In the last case a [2 + 4]-cycloadduct as well as an ene-reaction product is formed. The speed of intramolecular LiX-elimination from 1,LiX decreases in the order: 1, LiOTos 〉 1,LiCL 〉 1,LiBr 〉 1,Lil 〉 1,Ph2PO4Li 〉 1,LiSPh ≍ 1,LiF 〉 1,Ph2PO2Li.
    Notes: Der thermische Zerfall von Me2XSi—CLi(SiMe3)2 (1,LiX) führt in Diethylether bei -102 bis 10°C unter intramolekularer LiX-Eliminierung (X = Hal, TosO, Ph2POn, PhS) zum 1,3-Disilacyclobutan [Me2Si—C(SiMe3)2]2 (2). Reaktives Zwischenprodukt ist das Silaethen Me2Si=C(SiMe3)2 (1), dessen intermediäre Bildung auf kinetischem Wege durch Bestimmung von Reaktionsordnung und -geschwindigkeit der Eliminierungsreaktion sowie auf chemischem Wege durch Abfangen von 1 mit 2,3-Dimethyl-1,3-butadien wahrscheinlich gemacht werden konnte. In letzterem Falle entsteht ein [2 + 4]-Cycloaddukt sowie ein En-Reaktionsprodukt. Die Geschwindigkeit der intramolekularen LiX-Eliminierung aus 1, LiX nimmt in der Richtung 1,LiOTos 〉 1,LiCL 〉 1,LiBr 〉 1,Lil 〉 1,Ph2PO4Li 〉 1,LiSPh ≍ 1,LiF 〉 1,Ph2PO2Li ab.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141105
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    Kleine Ringe, 34: Versuche zur Darstellung von Dimethyltetrahedran (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3916-3921 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Small Rings, 34: Attempts to Synthesize DimethyltetrahedraneIrradiation of dimethyltricyclo[2.1.0.02,5]pentanone (2) and 4,6-dimethyl-α-pyrone (6) in solution leads to products which are derivatives of 1,3-dimethylcyclobutadiene (1). However, in an argon matrix photochemical excitation of 2 results in the formation of methylenecyclobutene 12 which is in a photoequilibrium with vinylallene 11. Under analogous conditions pyrone 6 yields photostable 1,3-dimethylcyclobutadiene (1) via the bicyclic form 9. It is possible that dimethyltetrahedrane (14) is an intermediate in the decarbonylation of 2 into 11 ⇌ 12.
    Notes: Bestrahlung von Dimethyltricyclo[2.1.0.02,5]pentanon (2) und 4,6-Dimethyl-α-pyron (6) in Lösung führt zu Produkten, die sich von 1,3-Dimethylcyclobutadien (1) ableiten. In einer Argon-Matrix dagegen entsteht aus 2 bei photochemischer Anregung das mit dem Methylencyclobuten 12 in einem Photogleichgewicht stehende Vinylallen 11. Unter analogen Bedingungen liefert Pyron 6 über die bicyclische Form 9 photostabiles Cyclobutadien 1. Es ist möglich, daß bei der Decarbonylierung von 2 in 11 ⇌ 12 Dimethyltetrahedran (14) als Zwischenprodukt auftritt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141214
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  • 118
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    Kleine Ringe, 33: Versuche zur Darstellung von Diphenyltetrahedran (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3906-3915 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Small Rings, 33: Attempts to Synthesize DiphenyltetrahedraneCarbene 7, formed on photochemical or thermal excitation of (2,3-diphenyl-2-cyclopropen-1-yl)-diazomethane (6i), splits mostly into two acetylenes 8 und 9 instead of undergoing an intramolecular cycloaddition. Photolysis of the Masamune ketone 16 depending on the reaction conditions gives either p-terphenyl or a mixture of the two cyclooctatetraenes 18 und 19. The intermediate formation of tetrahedrane 10 would fit into the mechanistic picture of this fragmentation.
    Notes: Das bei photochemischer oder thermischer Anregung von (2,3-Diphenyl-2-cyclopropen-1-yl)diazomethan (6i) entstehende Carben 7 geht anstatt einer intramolekularen Cycloaddition bevorzugt eine Fragmentierung in die beiden Acetylene 8 und 9 ein. Bei Belichtung des Masamune- ketons 16 kann abhängig von den Reaktionsbedingungen entweder p-Terphenyl oder ein Gemisch der beiden Cyclooctatetraene 18 und 19 isoliert werden. Die intermediäre Ausbildung des Tetrahedrans 10 fügt sich gut in das mechanistische Bild ein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141213
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  • 119
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    Kleine Ringe, 37: Weitere Versuche zur Matrixisolierung von Tetramethyltetrahedran (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3959-3964 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Small Rings, 37: Further Attempts on Matrix Isolation of TetramethyltetrahedraneIrradiation of diketone 4 or cyclobutenedicarboxylic anhydride 6 in an argon matrix leads to tetramethylcyclopentadienone (5). On the contrary, the valence isomeric anhydride 7 gives cyclobutadiene 3 via lactone 8 which also can be prepared directly from α-pyrone 10. Tetramethyltetrahedrane (2) cannot be detected.
    Notes: Belichtung von Diketon 4 oder Cyclobutendicarbonsäureanhydrid 6 in einer Argonmatrix führt zu Tetramethylcyclopentadienon (5). Im Gegensatz dazu liefert das zu 6 valenzisomere Anhydrid 7 über das bicyclische Lacton 8, welches auch direkt aus dem α-Pyron 10 zugänglich ist, das Cyclobutadien 3. Tetramethyltetrahedran (2) ist nicht nachweisbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141217
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  • 120
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    Radikalionen, 47. Notiz: Die Strukturänderung während der Einelektronen-Oxidation von Bis(dimethylamino)disulfid (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2632-2639 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Radical Ions, 47. Note on the Structural Change during the One-Electron Oxidation of Bis(dimethylamino) DisulfideOn one-electron oxidation, (H3C)2N—S—S—N(CH3)2 considerably changes its structure: where as the neutral molecule according to the ionization band pattern of the PE spectrum displays N and S lone pairs perpendicular to each other, as ESR spectroscopic comparison suggests a planarized skeleton for the radical cation. INDO closed and open shell total energy hypersurfaces for the model compounds H2N—S—S—NH2 and support the discussion of the spectra.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140725
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    Über Metallalkyl- und -aryl- Verbindungen, XXVII. Darstellung und Kristallstruktur von Bis(phenylethinyl)bis-(N,N,N′,N′-tetramethylethylendiamin)magnesium, Mg(C≡CPh)2(tmeda)2 (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2640-2643 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal Alkyl and Aryl Compounds, XXVII. Preparation and Crystal structure of Bis(phenylethynyl)bis(N, N, N′,N′-tetramethylethylenediamine)magnesium, Mg(C≡CPh)2(tmeda)2The title compound has been prepared from bis(phenylethynyl)magnesium and N, N, N′,N′-tetramethylethylenediamine (tmeda) and investigated by X-ray diffraction methods (orthorhombic space group Cmcm, Z = 4, 696 (reflections, R = 0.049). It represents a first example of an organomagnesium compound with octahedral coordination of the central atom. The phenylethynyl ligands are in trans position.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140726
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  • 122
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    Darstellung und Eigenschaften von B(OTeF5)3, Cs[B(OTeF5)4] und B(OTeF5)3 · CH3CN (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2644-2648 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation and Properties of B(OTeF5)3, Cs[B(OTeF5)4], and B(OTeF5)3·CH3CNInteraction of BCl3 with HOTeF5 affords B(OTeF5)3 (1) in quantitative yield. This compound reacts with CsOTeF5 to give Cs[B(OTeF5)4] (2) and with acetonitrile to form the adduct B(OTeF5)3·CH3CN (3). Thermolysis of 1 above 130°C leads to TeOF4 which cannot be isolated, but dimerizes to 4 and polymerizes to F5Te[OTeF4]nOTeF5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140727
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  • 123
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    Synthese von Arginin-haltigen Peptiden mit dem Kondensationsreagenz Tris(dimethylamino)phosphan/Hexachlorethan/1-Hydroxybenzotriazol (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2649-2652 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Arginine Containing Peptides by Means of the Condensing Reagent Tris(dimethylamino)phosphane/Hexachloroethane/1-HydroxybenzotriazoleThe combination of the title reagents is well suited for building up protected oligopeptides contatining arginine.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140728
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  • 124
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    Darstellung und Eigenschaften von und Reaktionen mit metallhaltigen Heterocyclen, XVI. Fünfgliedrige Wolfram-, eisen- und nickelhaltige Metallacycloalkane (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2653-2657 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation and Properties of, and Reactions with, Metal-Containing Heterocycles, XVI1) Five-Membered Tungsten-, Iron-, and Nickel-Containing MetallacycloalkanesThe metallacyclopentanes, (3a-c) [m = 1-3: LnM = h5-C5H5Ni (3a), h5-C5H5Fe (3b), h5-C5H5W (3c)] are obtained by reductive cycloelimination of the complexes Ln(OC)m-1M(X)PPh2[CH2]3Cl (2a-c) with sodium amalgam. 3b is also formed from h5-C5H5-(OC)2FeBr (1b) and PPh2[CH2]3MgCl. 3a,b insert SO2 into their M—C σ bond to give the cyclic S-sulfinates (4a,b).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140729
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  • 125
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    N-Ethylcarboxamide von lyxo-Purinnucleosiden (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2947-2955 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N-Ethyl lyxo Purine Nucleoside CarboxamidesMethyl-2,3-O-isopropylidene lyxuronate (1a) was transformed into 1 α-chloro-1-desoxy-N-ethyl-2,3-O-isopropylidene lyxuronamide (2d). Direct molten state condensation of 2d with silylated 6-chloro- and 2,6-dichloropurine (4a, b) yields mainly N-ethyl-N-9-purinyl nucleoside carboxamides with α and β-configuration (5a, b and 6a, b). The structure of these compounds was established from 1H- and 13C-NMR data.
    Notes: Aus 2,3-O-Isopropylidenlyxuronsäure-methylester (1a) wurde was 1 α-Chlor-1-desoxy-N-ethyl-2,3-O-isopropylidenlyxuronamid (2d) hergestellt. Schmelzkondensation mit silyliertem 6-Chlor- und 2,6-Dichlorpurin (4a, b) lieferte im wesentlichen die N-9-verknüpften α- und β-konfigurierten N-Ethyl-lyxo-purinnucleosidcarboxamide 5a, b und 6a, b. Die Struktur der erhaltenen Nucleoside wurde 1H- und 13C-NMR-spektroskopisch gesichert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140904
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  • 126
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    Reaktion von Acetyl-Übergangsmetallkomplexen mit Phosphor-Yliden - ein weiteres Beispiel zur Halogenid/Metallat-Analogie (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2956-2970 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Acetyl Transition Metal Complexes with Phosphorus Ylides - a Further Example of Halide/Metalate AnalogyThe reaction of the acetyl metal complexes LnM—C(O)CH3 [LnM = C5H5(CO)2Fe, C5H5(CO)3Mo, C5H5(CO)2[P(CH3)3]Mo] with the phosphorus ylides (CH3)3P=CH2, C2H5(CH3)2P=CH2, (C2H5)3P=CHCH3 and (C4H9)3P=CH2 in the ratio 1:2 yields the corresponding acetyl-substituted ylides R3P=CR′C(O)CH3 3a-d (R = CH3, C2H5, n-C4H9; R′ = H, CH3) and phosphonium metalates [R4P][MLn]4a-d, 6a, b via heterolysis of the Fe—C-σ-bond and transylidation. With CH3C(O)Cl an analogous way of reaction is observed, which however can be repeated to give the diacetyl ylides R3P=C(COCH3)2 8a, b (R = Ch3, n-C4H9). The new compounds are characterized by spectroscopic methods (NMR, IR) and further reactions.
    Notes: Die Umsetzung der Acetyl-Metallkomplexe LnM—C(O)CH3 [LnM = C5H5(CO)2Fe, C5H5(CO)3Mo, C5H5(CO)2[P(CH3)3]Mo] mit den Phosphor-Yliden (CH3)3P=CH2, C2H5(CH3)2P=CH2, (C2H5)3P=CHCH3 und (C4H9)3P=CH2 im Verhältnis 1 : 2 liefert unter Heterolyse der Fe—C-σ-Bindung und Umylidierung die entsprechenden Acetyl-Ylide R3P=CR′C(O)CH3 3a-d (R = CH3, C2H5, n-C4H9; R′ = H, CH3) und Phosphonium-metallate [R4P][MLn] 4a-d, 6a, b. Mit CH3C(O)Cl wird ein analoger Reaktionsverlauf nachgewiesen, der sich aber wiederholen und zu Diacetyl-Yliden R3P=C(COCH3)2 8a, b (R = CH3, n-C4H9) führen kann. Die neuen Verbindungen werden spektroskopisch (NMR, IR) und durch Folgereaktionen charakterisiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140905
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    Darstellung und Reaktionen von kationischen Chlorobis(phosphan)platin(II)-Komplexen (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2971-2978 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Reactions of Cationic Chlorobis(phosphane)platinum(II) Complexes[(R3P)2Pt(Cl)H2O]+BF-4 (1) and (R3P)2Pt(Cl)OSO2CF3 (2) have been prepared by abstraction of chloride from cis-(R3P)2PtCl2 using tetrafluoroboric acid or trifluoromethanesulfonic acid, respectively. The protons of the aqua ligand in 1 form hydrogen bridges to the BF-4 anion. The acidic complexes 1 and 2 are useful starting materials for new platinum(II) complexes. HCO-3 neutralizes 1 to form the carbonato complex (Et3P)2PtO2CO (5). The heterogenous reaction of 2a with glycinate gives the cationic chelate complex (6). The coordinated water of 1 is easily substituted by other ligands, e. g. phosphanes. The chloro-bridged complexes [(R3P)2PtCl2Pt(PR3)2]2+ are formed by treatment of 1 or 2 with ethers.
    Notes: [(R3P)2Pt(Cl)H2O]+BF-4 (1) und (R3P)2Pt(Cl)OSO2CF3 (2) (R = Et, n-Bu, Ph; 2 PR3 = Ph2PCH2CH2PPh2) werden durch Chlorid-Abstraktion aus cis-(R3P)2PtCl2 mit Tetrafluoroborsäure bzw. Trifluormethansulfonsäure erhalten. Die Protonen des Aqua-Liganden von 1 bilden Wasserstoffbrücken zum BF-4-Anion aus. Die sauren Komplexe 1 und 2 lassen sich zur gezielten Synthese neuer Platin(II)-Komplexe nutzen. In heterogener Reaktion entsteht aus 2a mit Glycinat der kationische Chelatkomplex (6). Hydrogencarbonat neutralisiert 1 unter Bildung des Carbonatokomplexes (Et3P)2PtO2CO (5). Das koordinierte H2O in 1 läßt sich leicht durch andere Liganden, z. B. Phosphane, ersetzen. 1 und 2 bilden in Ethern die Chloro-verbrückten Dikationen [R3P)2PtCl2Pt(PR3)2]2+.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140906
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    Metall-Bor-Verbindungen, 13. Zur Synthese und Reaktivität einiger (Trimethylstannyl)borane (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3056-3062 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal-Boron Compounds, 13. Synthesis and Reactivity of some (Trimethylstannyl)boranes2)The preparation of some amino(trimethylstannyl)boranes and their chemical properties are described. With Me3SnLi (Me = CH3) as a reagent only the synthesis of Me3SnB(NR2)2 (1a, b), Me3SnBCl(NR2) (2a, b), and (Me3Sn)2BNR2 (3b) was achieved. The stannylboranes Me3SnB(NR2)2 show astonishing thermal stability. Their Sn—B bonds are broken by hydrogen, the halogens, and chalcogens as well as by alcohols. HCl cleaves the B—N bond.
    Notes: Die Darstellung einiger Amino(trimethylstannyl)borane und deren chemische Eigenschaften werden beschrieben. Mit Me3SnBCl(NR2) (1a, b) und Me3SnBCl(NR2) )2a, b) (Me3Sn)2BNR2 (3b). Die Stannylborane Me3SnB(NR2)2 sind thermisch erstaunlich stabil. Ihre Sn—B-Bindungen werden von Wasserstoff, den Halogenen, Chalcogenen und Alkoholen gespalten, während HCl die B—N-Bindung öffnet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140912
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    Radikale durch Oxidation von λ3-Phosphorin-Derivaten (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3019-3023 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Radicals by Oxidation of λ3-Phosphorin DerivativesThe first ESR spectra, which are observed when 2,4,6-trisubstituted λ3-phosphorins 1a-c are oxidized electrolytically or with dichlorodicyanoquinone (DDQ) in dichloromethane or tetracyanoethene (TCNE) in 1,2-dimethoxyethane, are not - as formerly supposed - those of λ3-phosphorin cation radicals 2a-c. They are secondary radicals of the λ4-phosphorin-type 3 which are produced from the very short living radicals 2 by addition of water from the solvent. Oxidation of 1c in dichloromethane/methanol with DDQ affords the 2,4,6-tri-tert-butyl-1-methoxy-λ4-phosphorin radical 3′c. Further oxidation of the radicals 3 produces the very stable radicals 7a-c, once again by addition of water and deprotonation. Their ESR spectra are very similar to those of the „neutral radicals“, described in the precedent paper, which are formed by the electrolytic oxidation of 1,1-dimethoxy-λ5-phosphorins in dichloromethane in the presence of lithium bromide or by oxidation with lead tetrabenzoate and which are the methyl esters of 7.
    Notes: Die ersten ESR-Spektren, die man bei der elektrolytischen Oxidation von 2,4,6-trisubstituierten λ3-Phosphorinen 1a-c, der Oxidation mit Dichlordicyanchinon (DDQ) in Dichlormethan oder der mit Tetracyanethen (TCNE) in 1,2-Dimethoxyethan beobachtet, sind nicht, wie früher angenommen, die der λ3-Phosphorin-Kationradikale 2a-c. Es sind die von Folgeradikalen vom λ4-Phosphorintyp 3, die aus den sehr kurzlebigen Radikalen 2 durch Addition von Wasser aus dem Lösungsmittel entstehen. Methanolzusatz zum Dichlormethan bei der Oxidation von 1c mit DDQ führt zum 2,4,6-Tri-tert-butyl-1-methoxy-λ4-phosphorin-Radikal 3′c. Bei weiterer Oxidation der Radikale 3 entstehen unter erneuter Addition von Wasser und Deprotonierung die sehr beständigen Radikale 7a-c. Ihre ESR-Spektren unterscheiden sich nur wenig von denen der in der vorstehenden Mitteilung beschriebenen „Neutralradikale“, die bei der elektrolytischen Oxidation aus 1,1-Dimethoxy-λ5-phosphorinen in Dichlormethan bei Anwesenheit von Lithiumbromid oder der Oxidation mit Bleitetrabenzoat entstehen und die den Methylestern von 7 entsprechen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140909
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  • 130
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    Beiträge zur Chemie des Bors, 120. Tetraorganyldiborane(4): Darstellung und Stabilität (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3044-3055 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 120. Tetraorganyldiboranes(4): Preparation and Stabilitytert-Butylation of B2(OCH3)4 by LiC(CH3)3 proceeds via [(CH3)3C](CH3O)B—B(OCH3)[C(CH3)3] (1) to give tri-tert-butylmethoxydiborane(4) (2). Tetraalkylation of B2(OCH3)4 is achieved by isopropyllithium; no reaction intermediates were found in this case. Al(C2H5)3 reacts with B2(OCH3)4 to give B2(C2H5)4 which is stable only below - 30°C. On the other hand the CH3O group in 2 is replacable by CH3, and the CH3O groups in 1 by ethyl groups. Thus, product control by steric factors is evident. - The thermal stability of tetraorganyldiboranes(4) is controlled by the steric screening of the boron atoms: tetraisopropyldiborane(4) decomposes slowly at room temperature, tetraethyldiborane(4) rapidly at - 20°C.
    Notes: Die tert-Butylierung von B2(OCH3)4 mit LiC(CH3)3 führt über die Stufe [(CH3)3C](CH3O)B—B-(OCH3)[C(CH3)3] (1) zu Tri-tert-butylmethoxydiboran(4) (2). Die Tetraalkylierung von B2(OCH3)4 gelingt mit Isopropyllithium; Isopropylmethoxydiboran(4)-Zwischenstufen sind nicht faßbar. Al(C2H5)3 reagiert mit B2(OCH3)4 zu dem nur unterhalb von - 30°C stabilen B2(C2H5)4. Die CH3O-Gruppe in 2 ist gegen eine CH3-Gruppe ersetzbar, die CH3O-Gruppen von 1 gegen Ethylgruppen. Produktkontrolle erfolgt somit durch sterische Effekte. - Die thermische Stabilität der Tetraorganyldiborane(4) wird von der sterischen Abschirmung der Boratome gesteuert: Tetraisopropyldiboran(4) zersetzt sich langsam bei Raumtemperatur, Tetraethyldiboran(4) rasch bei - 20°C.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19811140911
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  • 131
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    Beiträge zur Chemie des Bors, 119. Darstellung und Struktur von Tris[bis(organylthio)boryl]aminen (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3024-3043 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 119. Synthesis and Structure of Tris[bis(organylthio)boryl]aminesNMR data of Tris[bis(organylthio)boryl]amines, N[B(SR)2]3, prepared by two different routes, indicate chemically equivalent RS groups in solution. The rather weak screening at boron and nitrogen agrees with the competition of three boron atoms for the lone pair of electrons at nitrogen, e.g. weak BN-π-bonding. - The equivalence of the RS groups is lost in the solid state. One(RS)2B group in each of the compounds 1-4 is strongly twisted against the B3N plane, and following the series 1, 2, 4, and 3 the other two orient themselves more and more coplanarily to this plane. Accordingly, a relatively long BN bond (147-148 pm) is observed besides two shorter BN bonds (143-145 pm) in each of these compounds. This is experimental evidence for the dependence of the B—N distance from π-bond order and its angular dependence. In addition, the structures of the 1,3,2-dithiaborolan, the 1,3,2-benzodithiaborol, and the 1,3,2-dithiaborolene ring systems have been ascertained. Only the latter two posses planar rings. - Mass spectrometric fragmentation of the tris[bis(organylthio)boryl]amines proceeds with preferential retention of BN bonding. For instance, the molecular ion of 2 breaks apart by three successive eliminations of ethylene with formation of the radical cation of NB3S6+ (12), derived from a hitherto unknown tricyclic system.
    Notes: Tris[bis(organylthio)boryl]amine, N[B(SR)2]3, nach zwei verschiedenen Verfahren dargestellt, besitzen in Lösung nach NMR-Untersuchungen chemisch äquivalente RS-Gruppen. Die gefundene geringe Abschirmung des Bors und Stickstoffs steht in Übereinstimmung mit der Konkurrenz von drei Boratomen um das freie Elektronenpaar am Stickstoff, d. h. schwacher BN-π-Bindung. - Im festen Zustand der Verbindungen 1-4 ist dagegen jeweils eine der drei (RS)2B-Gruppen stark gegen die B3N-Ebene verdrillt, und in der Reihe 1, 2, 4 und 3 zunehmend stellen sich die beiden anderen koplanar zu dieser Ebene ein. Dementsprechend beobachtet man eine relativ lange (147-148 pm) neben zwei kürzeren BN-Bindungen (143-145 pm). Dies ist ein experimenteller Beleg für die Abhängigkeit des B—N-Abstands von der π-Bindungsordnung zwischen B und N und ihrer Winkelabhängigkeit. Zugleich wurde die Struktur des 1,3,2-Dithiaborolan-, des 1,3,2-Benzodithiaborol- und des 1,3,2-Dithiaborolen-Ringes ermittelt. Nur die beiden letztgenannten Heterocyclen besitzen ein planares Ringgerüst. Die massenspektrometrische Fragmentierung der Tris[bis(organylthio)boryl]amine verläuft bevorzugt unter Erhaltung der BN-Bindungen. Dabei zerfällt das Molekül-Ion von 2 vor allem unter sukzessiver Abspaltung von 3 mol Ethylen und Bildung des Radikal-Kations NB3S6+ (12), das sich von einem bisher unbekannten Tricyclus ableitet.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19811140910
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    Bausteine von Oligosacchariden, XXX. Neue effektive β-Glycosidsynthese für Mannose-Glycoside Synthesen von Mannose-haltigen Oligosacchariden (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3102-3114 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Building Units for Oligosaccharides, XXX. New Efficient β-Glycoside Synthesis of Mannose Glycosides Syntheses of Mannose Containing OligosaccharidesA new method was developed for the stereo selective synthesis of oligosaccharides containing a β-linked mannose-unit which were hitherto not available by direct synthesis. The glycoside synthesis is promoted by a silversilicate-catalyst which was precipitated on aluminium oxide. The trisaccharides 20 and 31 (see german summary) and the tetrasaccharide 33 were synthesized, demonstrating the advantages offered by block synthesis.
    Notes: Es wird eine neue Methode zur selektiven Synthese von Oligosacchariden mit β-verknüpfter Mannose-Einheit entwickelt, für deren direkte Gewinnung es bisher kein Verfahren gab. Als Katalysator dient ein auf Al2O3 niedergeschlagenes Silbersilicat. Es werden die Trisaccharide β-D-Man-(1→4)α-D-Gal-(1→4)-L-Rha (20) und sowie das Tetrasaccharid 33 synthetisiert. Hierbei werden die Vorteile der Blocksynthese demonstriert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140916
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  • 133
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    Ein cyclisches Carbodiphosphoran und eine offenkettige Vergleichsverbindung (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3063-3069 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Cyclic Carbodiphosphorane and an Open-chain Reference CompoundThe cyclic carbodiphosphorane 8 is prepared from bis(diphenylphosphino)methane (1) and 1,3-dibromopropane, via a diphosphonium salt 6 and a semiquaternary salt 7, through transylidation with salt-free trimethyl methylene phosphorane. The structure is established by 1H-, 13C-, 31P-NMR and mass spectrometry, as well as by X-ray diffraction. Reprotonation with anhydrous HCl regenerates the diphosphonium salt 6. With tetrahydrofuran-borane, 8 is converted into a 1:1-borane complex 9, with the BH3 acceptor attached to the double-ylide carbon bridge. Methylation with CH3I occurs in the same position (10). 1:1-complexes (11, 12) are also formed with dimethylzink and -cadmium. The products are probably dimeric and show a rapid CH3-exchange in solution. - The already known open-chain analogue CH3(C6H5)2P=C=P(C6H5)2CH3 (4) resembles 8 in many respects, including the molecular structure. In the coordination interaction with metals a metalation in the CH3-groups in strongly favoured, however, as it is again shown in the nickel complex 5.
    Notes: Aus Bis(diphenylphosphino)methan (1) und 1,3-Dibrompropan wird über ein Diphosphoniumsalz 6 und ein Semiquartärsalz 7 durch Umylidierung mit salzfreiem Trimethylmethylenphosphoran das cyclische Carbodiphosphoran 8 dargestellt. Der Strukturbeweis gelingt über 1H-, 13C-, 31P-NMR-und Massenspektrum sowie durch eine Röntgenbeugungsanalyse. Durch wasserfreien Chlorwasserstoff wird das Diphosphoniumsalz 6 zurückgebildet. Mit Tetrahydrofuran-Boran wird ein 1:1-Komplex 9 erhalten, der den BH3-Akzeptor am Doppelylid-Brückenkohlenstoffatom gebunden hat. In gleicher Position erfolgt die Methylierung mit Methyliodid (10). Mit Dimethylzink und -cadmium entstehen 1:1-Komplexe (11, 12) vermutlich dimerer Struktur, die in Lösung raschen CH3-Austausch zeigen. - Das schon bekannte offenkettige Analogon CH3(C6H5)2P=C=P(C6H5)2CH3 (4) gleicht in vielen Eigenschaften, einschließlich seiner Molekülstruktur, dem Heterocyclus 8 Bei der Komplexbildung mit Metallen erfolgt hier jedoch bevorzugt Eintritt in die CH3-Gruppen. Der Nickelkomplex 5 ist dafür ein charakteristisches Beispiel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140913
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  • 134
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    Glass capillary SCOT columns by a single-step coating method (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 11-16 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; SCOT column ; Coating, liquid phase ; Single-step coating ; Phenols ; Phenolic acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A single-step coating method for the preparation of glass capillary SCOT columns is described. It is reproducible and less time-consuming than the well-known two-step coating procedures. Other methods attempted are discussed briefly. Both the flame ionization and electron capture detectors could be used in conjunction with temperature programming. The separations achieved with an “activity mixture”, phenols and phenolic acids, illustrate the resolution obtained. The columns are suitable for quantitative determinations and a comparison is made with a conventional packed column.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040104
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  • 135
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    High-speed aqueous gel permeation chromatography of pollen allergens (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 35-36 
    Details
    ISSN: 0935-6304
    Keywords: Gel permeation chromatography, GPC ; High-speed analysis ; Pollen allergen extract ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040109
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  • 136
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    Continuous and gradient TLC development of 4-dimethylaminoazobenzene-4′-sulfonyl amino acid derivatives (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 115-120 
    Details
    ISSN: 0935-6304
    Keywords: TLC ; Gradient and continuous development ; Amino acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thin-layer gradient elution chromatography is a convenient technique for separation of very complicated mixtures; in some cases the gradient technique can be replaced by continuous development. The two techniques are compared in practice by using them to separate a mixture of dabsyl derivatives of amino acids.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040305
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  • 137
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    Rapid separation of isomeric Xylenes on a short liquid crystal-coated glass capillary in the supercooled temperature range (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 123-124 
    Details
    ISSN: 0935-6304
    Keywords: (GC)2 in short capillaries ; Liquid crystalline stationary phase ; Supercooled temperature range ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040307
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  • 138
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    Improved separation of glycosylated tryptic peptides by RP-HPLC (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 302-304 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography ; Hemagglutinin glycoprotein of influenza virus investigated ; Peptide separation ; 14C labeling for identification ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The potential of reverse-phase high-performance liquid chromatography (RP-HPLC) for the separation of the tryptic glycopeptides of the hemagglutinin (HA) glycoprotein of influenza virus has been investigated. Excellent separation was accomplished with sample recovery of at least 90-95% by the utilization of an octadecasilyl silica stationary phase and a phosphoric acid/n-propanol solvent system. Eight glycosylated tryptic peptide classes were resolved from the HA glycoprotein of the A/USSR/90/77 virus strain.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040615
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  • 139
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    Plate requirements in chromatography and distillation (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 477-478 
    Details
    ISSN: 0935-6304
    Keywords: Square relationship ; Effect of separation efficiency ; Simple equation for plate comparison ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040913
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    Product news (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 42-42 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040114
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  • 141
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    Quantitative evaluation of thin-layer chromatograms. 5. Calculation of reflectance and transmission using Markov chains (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 141-142 
    Details
    ISSN: 0935-6304
    Keywords: TLC ; Reflectance ; Transmission ; Probability vector ; Transition matrix ; Markov chains ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Changes of reflected and transmitted light in cases where a band lies in different sublayers of a thin-layer chromatogram are calculated by the use of Markov chains. The problem of a “random walk with absorbing barriers” is described and compared with the problem of transmission and reflectance of light in a layer of sorbent.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040315
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  • 142
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    Trace analysis of fungicides in grape juice and wine using glass capillary gas chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 151-155 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; XAD-2 resin ; Fungicide residues, determination in wine and grape juice ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fungicides Bupirimate, Fenarimol, and Vinclozolin were sprayed on Vines. The fruits were harvested 8 and 21 days after the final application and processed to juice and wine. The fungicide residues were determined by filtration of the samples throug XAD-2 after pH adjustment, elution with methylene chloride, and glass capillary gas chromatography with SE-30 as stationary phase. Residue values of the three compounds were reported before and after fermentation. The precision of the analytical method was established by spiking portuguese white wine and spanish grape juice with the three fungicides and Triadimefon. The recoveries were in the range 80%-100%, except for Vinclozolin.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040402
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  • 143
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    A simple and safe sealing technique for static coating (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 183-183 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; End-sealing technique for static coating ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040410
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    Product news (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 197-200 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040415
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  • 145
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    Qualitative evaluation of aromatic herbs by direct head space (GC)2 analysis. Methodology and some preliminary applications (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 215-217 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Direct method for flavor evaluation ; Aromatic herbs analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple, quick method is described for GC head space evaluation of herbs and drugs. The proposed procedure consists of milling a weighed sample of a certain herb in a glass device like a Braun MXK coffee grinder, modified in such a way that a special gas-tight valve allows the direct sampling of the vapors. Glass capillary columns are used to analyze the head space volatiles. Some preliminary applications of the method are given.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040504
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  • 146
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    A quick and clean technique for sealing capillary columns using the static coating method (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 232-232 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Static coating ; Sealing method ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040508
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  • 147
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    Glibenclamide in serum: HPLC determination with pre-column derivatization (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 237-239 
    Details
    ISSN: 0935-6304
    Keywords: HPLC fluorescence detection ; Pre-column derivatization ; Glibenclamide ; Serum drug levels ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040511
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  • 148
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    Chromatography calendar (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 253-254 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040516
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    Fourth International Symposium on Capillary Chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 42-42 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040113
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    HPLC with chemically bonded stationary phases. 4. Amide, carbamate and chiral α-aminoamide phases (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 81-83 
    Details
    ISSN: 0935-6304
    Keywords: HPLC bonded phases ; Derivatisation of aminopropyl silica ; Resolution of enantiomers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040208
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    Recent developments in chromatography and electrophoreses, 10. Edition by Alberto Frigerio and Malcolm McCamish, Elsevier, Amsterdam (1980), pp. 340, $ 68.25 (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 308-308 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040618
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  • 152
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    The activity of silaceous capillary columns for gas-liquid chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 38-39 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Fused silica capillary column ; Activity ; Hydroxylated surfaces ; Dehydroxylated surfaces ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040111
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  • 153
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    Masthead (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981) 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040201
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  • 154
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    On-column detection using a fused silica column (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 83-85 
    Details
    ISSN: 0935-6304
    Keywords: HPLC ; Nanoliter volume detector ; 1.5 × 10-5 AU noise (0.1 μl 0.1% benzene in methanol) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040209
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  • 155
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    Product news (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 95-96 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040213
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  • 156
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    Ion-pair HPLC of chlorhexidine-A simple, rapid method for quantitation in pharmaceutical preparations (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 132-134 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Ion-pair reversed-phase HPLC ; Chlorhexidine in pharmaceutical preparations ; Quantitation within 0.66-3.41% relative standard deviation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040311
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  • 157
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    Letter to the Reader (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 142-142 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040316
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  • 158
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    Masthead (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981) 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040401
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  • 159
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    Influence of structure and polarity of polysiloxanes on retention of N-TFA butyl esters of amino acids (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 247-248 
    Details
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; No simple relationship found between polarity of polysiloxane phases and N-TFA amino acid butyl esters ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this work, we have investigated the influence of the polarities and structures of 13 polysiloxanes on the retention of some N-TFA N-butyl esters of amino acids. Gehrke [1] was the first to examine the possible relationship between polarity and retention data of amino acid derivatives for 9 stationary liquid phases. He concluded that the molecular structure of the stationary liquid phase is an important factor determining retention.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/jhrc.1240040515
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  • 160
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    Application of ion-exchange resin coated plates for thin-layer chromatography of sulfonamides and some other chemotherapeutic compounds (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 287-291 
    Details
    ISSN: 0935-6304
    Keywords: Thin layer chromatography, TLC ; Ion exchange resin plates/tert-butyl alcohol, H2O, Na2HPO4, Nacl; ethanol, H2O, Na-acetate, NaCl ; Sulfonamides and other chemotherapeutic substances ; Qualitative analysis ; Effect of pH variation on Rf values ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A thin-layer chromatographic method is described for sulfonamides and some other chemotherapeutic compounds. Ion-exchange resin precoated plates (Fixion 50 × 8 Na+, Chinoin, Budapest or Polygram Ionex-25 SA-Na, Macherey-Nagel and Co.,Düren, FRG) are employed with Na2HPO4 or Na-acetate (adjusted to different pH values) containing NaCl and tert-butyl alcohol or ethanol as developing solvent system. For qualitative and/or semiquantitave determinations the chromatograms can be stained: (A) with o-tolidine, after chlorination; (B) with p-dimethylaminobenzaldehyde; (C) with p-dimethylaminocinnamaldehyde.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040608
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  • 161
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    Separation of pesticides by capillary gas chromatography. Part 2: Organophosphorus insecticides (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 346-347 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; WCOT-glass capillary ; Organophosphorus insecticides ; Pesticides ; Metabolites ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This article considers the separation of 23 organophosphorus insecticides to which two metabolites have been added. The high resolution of the column permits detection of the Z and E isomers of three of these insecticides.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040708
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  • 162
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    Product news (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 361-362 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040715
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  • 163
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    Fused silica capillary column GC/MS for the analysis of priority pollutants (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 366-384 
    Details
    ISSN: 0935-6304
    Keywords: GC/MS ; Capillary columns, fused silica ; Priority pollutants ; Quantitation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Operational characteristics have been determined for fused silica capillary column (FSCC) GC/MS as applied to “extractable” priority polutants. Chromatographic data show excellent relative retention time (RRT) intralaboratory precision and interlaboratory accuracy when multiple internal standards are empolyed. Potential chromatographic problems, such as column overload and “double peaking”, are addressed. Response factor relative standard deviations (RSD) at 50 ng for most of the extractable priority pollutants over the long term indicated precise determination (i.e. RSD generally ≤ 10%). Linearity was demonstrated over two orders of magnitude for FSCC GC/MS analysis of compounds with relatively low and high RF (response factor) values. Potential quantitative problems, such as saturation, are discussed. For certain aromatic priority pollutants interlaboratory RF agreement was observed. This was noted as perhaps the most important property of FSCC GC/MS analysis when the multiple internal standard approach is utilized. Determinations of extractable priority pollutants are directly compared for paced column GC/MS and FSCC GC/MS analysis of separate and composited extracts. For six extracts analyzed in triplicate, the latter configuration was shown to produce more consistent results. In view of the superior analysis logistics of composite extract FSCC GC/MS analysis, this approach was established as the preferred method for the analysis of priority pollutants classified as extractable.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040803
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  • 164
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    Simultaneous detection of total and halogenated hydrocarbons in complex environmental samples (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 393-397 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, fused silica ; Simultaneous detection ; Splitting capillary effluent ; Detection limit of 1 ppm Archlor 1254 ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A state-of-the-art gas chromatographic system for automatic simultaneous detection of halogenated and normal hydrocarbons has been developed, which consists of a standard Hewlett-Packard 5880 with a fused silica capillary column, whose effluent is split between the standard flame ionization detector and a Tracor Hall electroconductivity detector. The system provedes excellent capillary chromatography results and high sensitivity for halogenated compounds (a detection limit of 1 ppm Archlor 1254 in fuel oil). Reliability has been provides in the daily analysis of complex environmental samples.Emergency response cleanup and the containment of hazardous chemical spills and chemical dump sites forces one to deal with samples that are very complex. The contain large numbers of naturally occurring organic compounds and varying types of organic pollutants. Capillary chromatographic techniques of gas chromatographic and gas chromatographic/mass spectrometric analyses are necessary to achieve the resolution required for the analysis of these samples.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040805
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  • 165
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    Thin-layer chromatography with high-boiling mobile phases.1. Investigation of the flow of the high-boiling mobile phasesPresented in part at the “CAMAG” conference held in the USSR on December 2-4,1980 (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 398-401 
    Details
    ISSN: 0935-6304
    Keywords: Thin layer chromatography ; Use of molten solids as mobile phase advantageous ; Migration at higher temperature (80-180°C) studied ; Correction of front position for unsaturated flow possible ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper considers some aspects of a new TLC technique using a molten mobile phase which is solid under ambient conditions. The flow of high-boiling mobile phase at elevated temperature in thin-layer chromatography has been investigated and it is shown that the equation Zf2 = kt is not applicable to migration of the high boiling mobile phase front. The flow stability of the high-boiling mobile phase is noted. It is suggested on the basis of studies of concentration profiles of the solidified mobile phases by scanning photometers that the shape of the mobile phase concentration profile be taken into account in calculation of Rf Values.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040806
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  • 166
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    Masthead (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981) 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041001
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  • 167
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    Analysis of urine by liquid chromatography in the ion-exchange or hydrophobic modeThis paper was presented in part at the 1980 Pittsburgh Conference, Atlantic City, N. J., March 1980. (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 500-507 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography ; Weak anion exchanger ; Octadecyl bonded packing ; Urine analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The analysis of ultraviolet-absorbing constituents in urine was undertaken by anion-exchange and reversed-phase liquid chromatography. A newly developed anion exchanger (TSK-IEX540 DEAE) was used for ion-exchange mode liquid chromatography and its high polarity and physical strength greatly reduced the analysis time. Up to 80 peaks were resolved within 30 min. Hydrophobicity values were used to predict the retention times of acids in reversed-phase mode liquid chromatography.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041005
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  • 168
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    Role of injection time and septum holder in split injection of polycyclic aromatic hydrocarbons (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 523-524 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Split injection ; Injection time influence ; PAH ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041009
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  • 169
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    An easy and reliable method for end-sealing glass capillary columns (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 533-534 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; End-sealing method for static coating ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041014
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  • 170
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    Combination of micro high performance liquid chromatography and fourier transform infrared spectrometry using the potassium bromide crystal buffer memory technique (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 532-533 
    Details
    ISSN: 0935-6304
    Keywords: Micro high performance liquid chromatography, MHPLC ; Fourier transform infrared spectrometry, FT- IR ; Combination of MHPLC and FT-IR ; KBr buffer memory technique ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041013
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  • 171
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    Liberti and Sievers win Tswett Medal 1981 (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 546-546 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041022
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  • 172
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    Reversed phase thin layer chromatography of phenols on chemically bonded C18 layers (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 557-560 
    Details
    ISSN: 0935-6304
    Keywords: Thin layer chromatography, TLC, HPTLC ; Reversed phase, chemically bonded ; Phenols ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041104
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  • 173
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    Rapid boiling point assay of tar from coal gasification by gas chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 580-581 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Coal gasification tar ; Boiling point distribution ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041108
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  • 174
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    An improved ion-pairing reagent for HPLC (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 584-585 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Reverse-phase mode ; TBAOAc/NH4OAc ion-pairing reagent circumvents problems ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041111
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  • 175
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    Chromatography calendar (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 591-594 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041115
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  • 176
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    Masthead (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981) 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041201
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  • 177
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    Simple GC/FID trace determination of toluene in silicone fluids (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 647-648 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Direct injection of silicone fluids method of choice for determining trace organic contaminants ; ≥ 1 ppm toluene determined ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041209
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  • 178
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    Resolution of organic sulfite diastereoisomers using silica gel liquid chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 653-654 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Diastereoisomer separation of organic sulfites ; Bis(2-aryl-3-oxotetrahydro-2H-1,2-oxazin-5-yl) sulfite ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041212
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  • 179
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    TLC determination of airbone carbofuran and quinalphos for industrial hygiene purposes (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 659-660 
    Details
    ISSN: 0935-6304
    Keywords: Thin layer chromatography, TLC ; Quantitation by TLC scanner ; Detection mode, reflection ; Measuring mode, absorbance ; RSD 3% for carbofuran and 1% for quinalphos ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041216
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  • 180
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    A selection method for high performance stationary phases in glass capillary GC. Part 1: The molecular weight distribution of polyglycol phases (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 3-5 
    Details
    ISSN: 0935-6304
    Keywords: Molecular weight distribution ; Polyglycol GC stationary phases ; Carbowax ; Ucon ; Pluronic ; Emulphor ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The width of the molecular weight distribution (MWD) of polymer stationary phases influences their polarity and other gas chromatographic characteristics. The MWD of the most frequently used polyglycol-type stationary phases such as Carbowax, Ucon, Emulphor and Pluronic has been determined and compared. The MWD determined by gel chromatography allows for the characterization of the actual batch of a stationary phase, provides a check on its consistency and helps to screen out the apparently less promising phases.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040102
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    Quantitative analysis of some preservatives in pharmaceutical formulations by different chromatographic methods (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 24-26 
    Details
    ISSN: 0935-6304
    Keywords: HPTLC ; HPLC ; GC/MS ; Methyl hydroxybenzoate (MHB) ; Propyl hydroxybenzoate (PHB) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Different chromatographic methods for determination of methyl hydroxybenzoate and propyl hydroxybenzoate in pharmaceutical formulations are compared. Procedures for HPTLC, HPLC and GC/MS are given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040106
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  • 182
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    Analysis of cardenolides of Convallaria majalis by high pressure liquid chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 37-38 
    Details
    ISSN: 0935-6304
    Keywords: HPLC ; Cardenolides in Convallaria majalis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cardenolides of Convallaria majalis were separated by reverse-phase HPLC on Partisil PXS 10/25 ODS columns using 25% acetonitrile as mobile phase. Periplorhamnoside, convallatoxin and either convallatoxol or convalloside were resolved from glycoside mixtures. Convallatoxin and periplorhamnoside were identified in plant extracts, convalloside and convallatoxol were not resolved from non-cardenolide material present in leaf extracts.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040110
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  • 183
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    Some comments on the barium carbonate (Grob) procedure for treating glass capillary columns for gas-liquid chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 79-80 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Glass capillary columns ; Barium carbonate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040207
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  • 184
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    Electronic Resource
    Application of multidimensional switching to the analysis of volatiles (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 86-89 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Packed columns ; Multidimensional switching, MDSS ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A multidimensional switching system with two packed columns has been used for the analysis of volatiles. Use of a high-boiling solvent and the backflush mode permitted total resolution of the mixture discussed in a short analysis time.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040210
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  • 185
    Electronic Resource
    Electronic Resource
    Masthead (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981) 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040301
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  • 186
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    A study of the effects of temperature and pressure on the retention time in series-coupled columns under conditions of constant mass flow rate (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 102-108 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Series-coupled columns with different stationary phases ; Independent temperature control of columns ; Constant mass flow rate ; Retention time expressions ; Theory ; Selectivity control ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The technique of controlling chromatographic selectivity by the adjustment of column temperatures in systems of series-coupled columns is investigated by means of a general model incorporating the effects of temperature and mobile phase compressibility. In a previous article the performance of series-coupled columns was investigated under conditions of constant overall pressure drop. The present paper, on the other hand, considers systems in which a constant mass flow rate is maintained at all temperatures. The expressions derived for the effective partition coefficient and the retention time are compared with those of the previous paper. The numerical results for two-column systems exhibit the same major trends as those for constant pressure drop. It is shown that the effective partition coefficient is slightly dependent on the mass flow rate.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040303
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  • 187
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    Electronic Resource
    Effect of adsorption on resolution in capillary gas chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 127-129 
    Details
    ISSN: 0935-6304
    Keywords: Gas liquid chromatography ; Open tubular capillary columns ; Adsorption and resolution ; Hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040309
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  • 188
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    Electronic Resource
    Rapid combined liquid chromatography/mass spectrometry method for quantitative analysis of atrazine (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 130-131 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography/mass spectrometry ; Atrazine ; Quantification ; Triazine herbicides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040310
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  • 189
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    Product news (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 143-145 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040317
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  • 190
    Electronic Resource
    Electronic Resource
    Chromatography calendar (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 147-148 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040318
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  • 191
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    Glass capillary gas chromatography with simultaneous flame ionization (FID) and Hall® element-specific (HECD) detection (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 164-168 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Simultaneous detection with effluent splitter ; Element-specific detection ; Petroleum residues ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two glass capillary gas chromatographic systems were equipped with inert effluent splitters which allowed simultaneous data acquisition using nonspecific and element-specific detectors. Simultaneous detection was achieved using the nonspecific flame ionization detector (FID) and the Hall® electrolytic conductivity detector (HECD) operated in either the sulfur-or the nitrogen-specific mode. Typical application of the simultaneous detection system as applied to analysis of petroleum residues is briefly described. The Hall electrolytic conductivity detector can be made element specific for halogen-, sulfur-, or nitrogen-containing compounds. Simultaneous detection enhances the information yield from a single sample injection and proves to be a powerful complementary technique when used with computerized gas chromatography/mass spectrometry.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040404
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  • 192
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    Glass capillary T-connections for high resolution GC (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 186-187 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Effluent splitter, preparation of ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040412
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  • 193
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    Electronic Resource
    Chromatography calendar (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 191-192 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040414
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  • 194
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    Electronic Resource
    Gas-liquid chromatography of amino acids: Columns and methodology as a basis for routine amino acid analysis using glass capillary gas chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 218-223 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Column preparation ; “Split” vs. “on-column” injection ; Amino acid analysis, quantitative 10 ng level ; Average relative standard deviation 1% ; Fish muscle protein analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A carefully Standardized technique is described for the preparation of glass capillary columns which can be used successfully for routine quantitative amino acid analysis. Comparison is made between two different modes of sample injection. Preliminary quantitative results from “split” injection and “on-column” injection techniques are evaluated statistically and it is concluded that the “on-column” system is a prerequisite for quantitative amino acid analysis by glass capillary gas chromatography. An analysis of fish muscle protein hydrolyzate illustrates an application of this technique and results are compared with those from a packed column analysis.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040505
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  • 195
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    Theoretical determination of optimum composition of the binary mobile phase for distribution of substances in thin-layer chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 224-227 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer adsorption chromatography ; Optimum separation ; Binary mobile phases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The measure of the distribution of a mixture of substances in TLC with a binary mobile phase is expressed as ΔRM1,2i,j which represents the difference between the RM values of substances i and j on use of the binary solvent 1 + 2 as the mobile phase. The possibility of determining its maximum value at an optimum composition of the binary mobile phase is demonstrated in this paper. This value can calculated from experimental and theoretical functions RM1,2 = f(Φ1) of substance i and j. More simply, ΔRM1,2i,j can be calculated theoretically from easily measurable adsorption parameters of excess adsorption isotherms and from chromatographic parameters obtained for pure solvents. The ΔRM1,2i,j value calculated theoretically can be utilized in a pilot technique for determination of the optimum composition of the mobile phase in gradient liquid chromatography.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040506
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  • 196
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    Glass capillary column chromatography of mixed derivatives of primary prostaglandins, 6-keto prostaglandin F1α and thromboxane B2 (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 437-443 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Gas chromatographic profiles ; n-Butylboronates ; Alkyl-oximes ; Primary prostaglandins ; 6-Keto prostaglandin F1α ; Thromboxane B2 ; Isomers of prostaglandin F1α ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This work describes the use of glass capillary columns (GCC) in the rapid concurrent analysis of primary prostaglandins (PGs) (e. g. PGE2, PGE2, PGF2α) and other functionally significant metabolites of arachidonic acid (AA) such as TXB2 and 6-keto PGF1α. The use of a new multistep mixed derivatization approach that generates the methyl esters of n-butylboronate, pentafluorobenzyloxime, trimethylsilyl ether derivatives of these compounds remarkably simplifies the GC profiling of the three main pathways of AA metabolism (PGs, thromboxane, and prostacyclin). Furthermore, isomeric species giving very similar or identical mass spectral patterns can be easily identified by their relative retention times on high efficiency capillary columns.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040903
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  • 197
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    Prediction of experimental parameters in combined isocratic and gradient elution reversed phase high performance liquid chromatography (RP-HPLC) using acetonitrile as organic modifier (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 276-279 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography ; Linear elution strength mobile phase technique ; Calculation of eluent compostion ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The use of gradient elution in RP-HPLC is increasing. Aqueous buffers, such as phosphate at pH 1.7, with acetonitrile as the organic modifier are particularly advantageous as eluents with linear elution strength (LES). In the isocratic mode, under the experimental conditions used, fairly good linearity exists between logk' and xB (xBº is the volume ratio of the organic modifier, i.e. acetonitrile) with a correlation coefficient of 0.9995. The relationship between isocratic and gradient elution parameters, such as xB, xBº (starting composition in gradient elution), m (slope of the linear gradient), is transparent and the parameters of interest can be predicted fairly accurately using simple equations. The proposed system could be used in elaboration of a general retention index system for organic molecules in RP-HPLC.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040606
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  • 198
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    Electronic Resource
    Abbenda (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 482-482 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040916
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  • 199
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    Electronic Resource
    Fused silica capillary GC/MS coupling: A new, innovative approach (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 495-499 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary column, fused silica ; Mass spectrometry ; Interface, direct coupling ; On-column injection ; Aflatoxin B1 ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel fused silica capillary GC/MS direct coupling is described which ensures quantitative transfer of sample from the point of injection to the ion source of a mass spectrometer without contacting any surfaces other than the column wall. This device permits GC analysis of highly labile substances. Aflatoxin B1, previously considered unassayable by GC, can now be determined by GC/MS.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240041004
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  • 200
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    Product news (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 309-314 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040619
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