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  • 1975-1979  (27)
  • 1979  (6)
  • 1978  (14)
  • 1976  (7)
  • Organic Chemistry  (14)
  • Inorganic Chemistry  (9)
  • Physics  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Phosphorhaltige Kohlenhydrate, XVII: Untersuchung der Hydrierung ungesättigter Glycosylphosphonate. Anomerer Effekt und A-Wert der Dimethylphosphono-Gruppe (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3325-3335 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorus-containing Carbohydrates, XVII: Studies on the Hydrogenation of Unsaturated Glycosylphosphonates. Anomeric Effect and A-Value of the Dimethylphosphono GroupBy hydrogenation unsaturated glycosylphosphonates of type 1 give rise to the formation of 2,3-dideoxyglycosylphosphonates 2 and 2,3,4-trideoxyglycosylphosphonates 3. Their product ratio depends on configuration and conformation of the educts 1a-f. 1H and 13H and 13C NMR data permit an assigment of the anomers of the hydrogenated glycosylphosphonates. For the one-bond coupling constant between 13C-1 and 31P the correlation 1JC, Peq 〉 1JC, Pax is valid, which exhibits a difference of 19-23 Hz. The unsaturated glycosylphosphonates show deviations from Hudson's isorotation rule. In dimethyl cis-4-methyl-1-cyclohexanephosphonate (9) the A-value of the dimethylphosphono group has been determined to 8.34 kJ/mol. The ratio of conformers in 3a leads to an anomeric effect of the dimethylphosphono group of 2.33 kJ/mol.
    Notes: Ungesättigte Glycosylphosphonate vom Typ 1 liefern bei der Hydrierung außer 2,3-Didesoxyglycosylphosphonaten 2 auch 2,3,4-Tridesoxyglycosylphosphonate 3. Das Produktverhältnis ist von Konfiguration und Konformation der Ausgangsprodukte 1a-f abhängig. 1H- und 13C-NMR-Daten erlauben eine Anomerenzuordnung der hydrierten Glycosylphosphonate. Für die 13C-31P-Direktkopplung an C-1 gilt 1JC, Peq 〉 1JC, Pax mit einer Differenz von 19-23 Hz. Die ungesättigten Glycosylphosphonate zeigen Abweichungen von der Hudsonschen Regel. Am Dimethyl-cis-4-methyl-1-cyclohexanphosphonat (9) wurde der A-Wert der Dimethylphosphono-Gruppe zu 8.34 kJ/mol bestimmt. Aus der Konformerenverteilung bei 3a ergibt sich der anomere Effekt der Dimethylphosphono-Gruppe zu 2.33 kJ/mol.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781111006
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  • 2
    Electronic Resource
    Electronic Resource
    The Inversion of the Amino Group in Vinylamine, a Flexible Model TreatmentA preliminary account of this work was given at the meeting of the Swiss Chemical Society in Geneva, October 9, 1976. (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 1418-1426 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Flexible model results for the —NH2 inversion in vinylamine are compared with microwave data published by Lovas et al. [3]. The information available on the spacing of inversion levels is found to be sufficient to rule out a planar equilibrium structure. Shifts of rotational constants upon excitation of the inversion are calculated for two predicted paths of motion derived from PRDDO geometry optimization results obtained by MiiIler & Brown [2]. Partial geometry optimization yields a path inconsistent with experiment but the path obtained from complete optimization produces shifts in excellent agreement with the observed shifts. A potential energy function compatible with experimental data on spacing of inversion levels is calculated from the observed inertia defects. The inversion angle at equilibrium is slightly smaller than the angle predicted from PRDDO calculations, and the barrier to inversion, ΔV = 1.08 ± 0.07 kcal/mol, is approximately half the PRDDO value.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610426
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  • 3
    Electronic Resource
    Electronic Resource
    Enhydrazine, 131) Einige Produkte aus 3-Hydroxy-1-methyl-5-pyrazolcarbonsäure- methylester und 1-Benzyl-3-hydroxypyrazol (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 268-273 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 131) Some Products from Methyl 3-Hydroxy-1-methyl-5-pyrazolecarboxylate and 1-Benzyl-3-hydroxypyrazoleSome esters and ethers of the 3-pyrazolones 1a, 2c and6a are Prepared. They are derived from the tautomeric 3-hydroxypyrazole forms in which the free starting compounds mostly occur. Some substitutions in 4-position are likewise described.
    Notes: Es werden einige Ester und Äther der 3-Pyrazolone 1a, 2c und 6a dargestellt, die sich von der tautomeren 3-Hydroxypyrazol-Form herleiten, in der auch die freien Ausgangsverbindungen vorliegen. Einige Substitutionen in 4-Stellung der 3-Hydroxypyrazole werden ebenfalls beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090127
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  • 4
    Electronic Resource
    Electronic Resource
    Synthese von Zuckerestern der Lysergsäure und 9,10-Dihydrolysergsäure (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 171-174 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Sugar Esters of Lysergic Acid and 9, 10-Dihydrolysergic Acid
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210126
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  • 5
    Electronic Resource
    Electronic Resource
    Darstellung von 5-Hydroxy-1,7-naphthyridin (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 443-445 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 5-Hydroxy-1,7-naphthyridineN-(p-Toluenesulfonyl)glycine ester 1b reacts with 2-(bromomethyl)nicotinic ester 2 to form the nicotinic acid derivative 3b. Cyclization of 3b, by elimination of sulfinic acid, leads to the 1,7-naphthyridine derivative 7, from which the title compound 8 is formed.
    Notes: N-(p-Toluolsulfonyl)glycinester 1b reagiert mit 2-(Brommethyl)nicotinsäureester 2 zum Nicotinsäurederivat 3b. Dieses läßt sich unter Eliminierung von Sulfinsäure zum 1,7-Naphthyridin-derivat 7 cyclisieren, aus dem die im Titel genannte Verbindung 8 erhalten wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790402
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  • 6
    Electronic Resource
    Electronic Resource
    Malondiamidine, II. Kondensationsreaktionen mit aromatischen Aldehyden (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1291-1299 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Malondiamidines, II. - Condensation Reactions with Aromatic AldehydesCondensation of malondiamidines 4 with double molar quantities of aldehydes 1 leads to the novel 2,5-disubstituted 4,6-diaminopyrimidines 6a - n. The reaction course (aminal formation, Knoevenagel condensation, and sigmatropic 1,5-hydrogen shift) is discussed. Use of salicylaldehyde in this reaction furnishes the benzopyrano[2,3-d]pyrimidines 13a - c by additional elimination of the amino component. The benzopyrano[2,3-d]pyrimidine 16 is obtained by condensation of salicylaldehyde and 3-amino-3-(1-pyrrolidinyl)acrylonitrile (15) in a 2:1 molar ratio.
    Notes: 2,5-Disubstituierte 4,6-Diaminopyrimidine 6a - n werden durch Kondensation von Malondiamidinen 4 mit Aldehyden 1 im Molverhältnis 1:2 erhalten. Der Chemismus dieser Reaktion (Aminalbildung, Knoevenagel-Kondensation, sigmatrope 1,5-Wasserstoffverschiebung) wird diskutiert. Salicylaldehyd als Aldehydkomponente liefert unter analogen Bedingungen unter zusätzlicher Eliminierung der Aminkomponente die Benzopyrano[2,3-d]pyrimidine 13a - c. Das Benzopyrano [2,3-d]pyrimidin 16 wird auch durch Kondensation von Salicylaldehyd und 3-Amino-3-(1-pyrrolidinyl)acrylonitril (15) gewonnen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790904
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesen von (-)-(S)- und (+)-(R)-Goniothalamin; absolute Konfiguration des natürlichen (+)-Goniothalamins (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 484-491 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of (-)-(S)- and (+)-(R)-Goniothalamin; Absolute Configuration of the Naturally Occurring (+)-Goniothalamin(-)-(S)-Goniothalamin and its naturally occurring (+)-(R)-enantiometer were synthesised from configurationally defined precursors. The absolute configurations were additionally confirmed by ozonolysis to (-)-(S)- and (+)-(R)-malic acid. The absolute configuration given for the compound in the literature is thus corrected.
    Notes: (-)-(S)-Goniothalamin und das (+)-(R)-Enantiomer wurden aus konfigurativ definierten Vorstufen synthetisiert. Die absoluten Konfigurationen wurden zusätzlich durch Ozonabbau zu (-)-(S)- und (+)-(R)-Äpfelsäure bestätigt. Die in der Literatur angegebene absolute Konfiguration des Naturstoffs wird berichtigt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790409
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  • 8
    Electronic Resource
    Electronic Resource
    Sila-Pharmaka, 181) Derivate des 1-(4-Chlorphenyl)silacyclohexans mit 3-(Diethylamino)propyl- und 2-(Diethylamino)ethyl-Gruppierungen (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1915-1924 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sila-Drugs, 181). - Derivatives of 1-(4-Chlorophenyl)silacyclohexane with 3-(Diethylamino)propyl and 2-(Diethylamino)ethyl GroupsThe preparation of the compounds 3a (and 3b) and 10, which derive from 1-(4-chlorophenyl)-1-(2-diethylaminoethoxy)silacyclohexane (sila-chlorophencyclane, IIa), is described. Compound 3b has been investigated pharmacologically and toxicologically. The biological properties of 3b and those of IIa (and chlorophencyclane) and its hydrochloride IIb are compared.
    Notes: Die Darstellung der Verbindungen 3a (sowie 3b) und 10, die sich vom 1-(4-Chlorphenyl)-1-(2-diethylaminoethoxy)silacyclohexan (Sila-Chlorphencyclan, IIa) ableiten, wird beschrieben. Die Verbindung 3b wurden pharmakologisch und toxikologisch untersucht. Die biologischen Eigenschaften von 3b wurden mit denen von IIa (sowie Chlorphencyclan) und seinem Hydrochlorid IIb verglichen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919791128
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  • 9
    Electronic Resource
    Electronic Resource
    Four-center photopolymerization. A heterogeneous topochemical solid-state reaction (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 1365-1379 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The four-center solid-state photopolymerization of distyrylpyrazine (DSP) and of 2,6-naphthalene bis(acrylic acid-2,4-dichloro phenyl ester) (NBA-DCP) was investigated by x-ray and microscopic techniques. In both cases the polymer grows as a separate product phase topotactically well arranged with respect to the monomer matrix. In the case of polymerization of DSP the space group of the monomer (Pbca) is not maintained but the polymer phase has space group P21ca. Nucleation and growth of the polymer phase was observed by light and electron microscopy. Nucleation occurs at defect sites. The polymer grows at different rates in different crystallographic directions which were identified by electron diffraction in the case of DSP. Polymerization thus occurs in the transition region between monomer crystal and product phase and not in the bulk of the crystal so that the four-center-type photopolymerization is best described as a heterogeneous solid-state reaction.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160803
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  • 10
    Electronic Resource
    Electronic Resource
    Umsetzung des 2-Butinsäuredianions mit Aldehyden; Synthese einiger Naturstoffe mit 5,6-Dihydro-2H-pyran-2-on-Struktur (1978)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 337-344 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of the 2-Butynoic Acid Dianion with Aldehydes; Synthesis of some Natural Products with 5,6-Dihydro-2H-pyran-2-one Structure1)The naturally occurring 5,6-dihydro-2H-pyran-2-ones 6a, 6b and 6e have been synthesised starting from the 2-butynoic acid dianion 1 and the aldehydes 2a  -  c with 5-hydroxy-2-alkynoates 4a  -  c as intermediates.
    Notes: Die natürlich vorkommenden 5,6-Dihydro-2H-pyran-2-onderivate 6a, 6b und 6e werden ausgehend von dem 2-Butinsäuredianion 1 und den Aldehyden 2a  -  c über die 5-Hydroxy-2-alkinsäureester 4a  -  c als Zwischenstufen synthetisiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197819780214
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