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  • 1
    Electronic Resource
    Electronic Resource
    Donorsubstituierte 2,4-Diazacyclopentadienone und indigoide 1,3,5,7-TetraazafulvaleneHerr Professor Dr. Karl Gewald zum 60. Geburtstag gewidmet (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 949-967 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Donor Substituted 2,4-Diazacyclopentadienones and Indigoid 1,3,5,7-TetraazafulvalenesHydrolysis of tris(diethylamino)imidazolylium chloride gives rise to 2,5-bis-diethyl-amino-4H-imidazolin-4-one; thiolysis leads, depending on conditions, to 2,5-bis-diethylamino-4H-imidazolin-4-thione or potassium 2,6-bis-diethylamino-1,3,5,7-tetraazafulvalene-4,8-dithiolate. The latter can be protonated to form green 2,6-bis(dimethylamino)-3,4,7,8-tetrahydro-1,3,5,7-tetraaza-fulvalen-4,8-dithione, a new indigoid compound, and alkylated to give blue 2,6-bis-diethylamino-4,8-bis-alkylthio-1,3,5,7-tetraazafulvalenes. Treatment of 2,5-bis-diethylamino-4H-imidazolin-4-thione with copper furnishes 2,6,4,8-tetrakis-diethylamino-1,3,5,7-tetraazafulvalene. - Oxidation of 2,6-bis-dimethylamino-3,4,7,8-tetrahydro-1,3,5,7-tetraazafulvalen-4,8-dithione gives rise to (2,2′-bis-diethylamino-4,4′-bi(4H-imidazol)-5,5′-dithione, corresponding to dehydroindigo, and reduction leads to a colorless compound, corresponding to leucoindigo.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320613
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  • 2
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 200. Zur Kenntnis B-funktionaler Diboryl-silyl- und Boryl-silyl-stannyl-amine (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 261-269 
    Details
    ISSN: 0009-2940
    Keywords: Bis(dichlorboryl)silylamines / (Dichloroboryl)(dithiaborolan-2-yl)(trimethylsilyl)amine / 1,3,2-(Benzodioxaborol-2-yl)(dichloroboryl)(trimethylsilyl)amine / Stannazane cleavage ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 200. - B-Functional Diboryl-silyl- and Boryl-silyl-stannyl-aminesStannazane cleavage of Cl3-nMenSiN(SnMe3)2 with an excess of BCl3 leads to bis(dichloroboryl)silylamines Cl3-nMenSiN(BCl2, 2-chlor-1,3,2-dithiaborolane, or 2-chloro-1,3,2-benzodioxaborole produce boryl-silyl-stannyl-amines of type X2BN(SiMe3)SnMe3 (2a-c). Cl2BN(SiCl3)SnMe3 (3) is obtained similarly from BCl3 and Cl3SiN(snMe3.)2. 3 decomposes on heating with SnN cleavage and formation of (Cl3SiN=BCl)4 (4). Asymmetrically substituted diborylamines Me3SiN(BX2)-BY2 are prepared by substitution reactions using Me3SiN(BCl2)BY2 or by stannazane cleavage of Y2BN(SiMe3)SnMe3 (2) and an appropriate boron halide. Constitution and conformation of the new diboryl-amines are deduced from multinuclear resonance spectra.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230207
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  • 3
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 203. Reaktionen einiger Nichtmetallelemente mit 9-Fluorenyliden(2,2,6,6-tetramethylpiperidino)boran (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 963-966 
    Details
    ISSN: 0009-2940
    Keywords: 9-Fluorenyl(2,2,6,6-tetramethylpiperidino)borane ; (9-Bromo-9-fluorenyl)(2,2,6,6-tetramethylpiperidino)boron bromide ; 1,2-Oxaboretane derivative ; 1,2,4,3-Trithiaborolane derivative ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 2031 Reactions of Some Non-Metallic Elements with 9-Fluorenylidene(2,2,6,6-tetramethylpiperidino)borane9-Fluorenylidene(2,2,6,6-tetramethylpiperidino)borane (1) is hydrogenated catalytically at its boron-carbon double bond producing 9-fluorenyl(2,2,6,6-tetramethylpiperidino)borane (2). Similarly, chlorine, bromine, and iodine add to this double bond, but only the bromine adduct 6a has been fully characterized. 1 is oxygen-sensitive. The oxidation product found is the 1,2-oxaboretane derivative 7, which is prepared independently by a [2 + 2] cycloaddition reaction from 1 and 9-fluorenone. Sulfur reacts with 1 to yield a trithiaborolane derivative, while P4 does not attach 1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230504
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and molecular structure of tin(IV) 1-pyrrolecarbodithioates (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1523-1528 
    Details
    ISSN: 0009-2940
    Keywords: 1-Pyrrolecarbodithioate derivatives ; Tin complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1-pyrrolecarbodithioate complexes of tin, PhSnCl(S2CNC4H4)2 (1) and Sn(S2CNC4H4)4 (2) have been synthesized and characterized by IR and NMR spectra (1H, 13C and 119Sn). δ119Sn suggests hexacoordination for 1 and an even higher coordination number for 2. X-ray structure determinations of these as well as of Me2Sn(S2CNC4H4)2 (3) have shown that 3 is one of the few known examples with a skew-trapezoidal bipyramidal configuration. 1 attains approximately a cis-octahedral geometry with two bidentate carbodithioate ligands with the Cl atom and the phenyl group in cis position. Complex 2 possesses two bidentate ligands while the other two are essentially anisobidentate leading to a structure between an octahedraon and a dodecahedron.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250702
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  • 5
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 216. Über die Komplexbildung von 1,3,2,4-Diphosphadiboretanen mit Pentacarbonylchrom sowie über die Darstellung und Reaktivität von Borylidenphosphan-Komplexen (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 875-887 
    Details
    ISSN: 0009-2940
    Keywords: 1,3,2,4-Diphosphadiboretanes, 2,4-bis(dialkylamino)- ; Boranes, (dialkylamino)bis(alkylphosphanyl)- ; Chromium, pentacarbonyl[2,3-bis(dialkylamino)1-1,3,2,4-diphosphadiboretane] complexes ; Chromium, pentacarbonyl[(2,2,6,6-tetramethylpiperidino)phosphane-P]- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 216[1]. - On the Complex Formation of 1,3,2,4-Diphosphadiboretanes with Pentacarbonylchromium and the Preparation and Reactivity of Borylidenephosphane Complexes2,4-Bis(dialkylamino)1-1,3,2,4-diphosphadiboretanes (R2NBP-CMe3)2 with sterically undemanding amino substituents are prepared together with the corresponding bis(phosphanyl)1-boranes R2NB(PHCMe3)2 by the reaction of R2NBCl2 with Li-P(H)CMe3. Complexes of 1,3,2,4-diphosphadiboretanes with one or two pentacarbonylchromium fragments were obtained by the reaction of the ligands with Cr(CO)5·THF or Cr(CO)5·NMe3. If substituents are sterically demanding, cycloreversion is observed with formation of [(aminoborylidene)1-phosphanyl-P]pentacarbonylchromium compounds tmpB=PR[Cr(CO)5] (10, 29) with an allene-like structure. Complex 29 may also be prepared by HCl elimination from tmp-B(Cl)-P(H)CMe3[Cr(CO)5] (34) with lithium diisopropylamide. This reaction can by reversed be the addition of HCl. The diphosphadiboretane 11 reacts with HCl, ethanol, and secondary amines with cleavage of all BP bonds. The X-ray structures of complexes (Et2NB - PCMe3)2[Cr(CO)5]2 (23) and (iPr2NB - PCEt3)2 [Cr(CO)5] (25) as well as of the diphosphadi-boretanes (Me2NB - PCMe3)2 (11) and (iPr2NB - PCEt3)2 (24) are presented. The intra ring angles of 23 remain almost unchanged upon complexation. In contrast, the B2P2 ring of 25 is slightly folded and its noncoordinated P atom approaches a planar environment.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260405
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  • 6
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 217. [2 + 2]1-Cycloadditionsreaktionen von 9-Fluorenyliden-(tetramethylpiperidino)boran mit Carbonyl-und Thiocarbonyl-Verbindungen (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1119-1125 
    Details
    ISSN: 0009-2940
    Keywords: Cycloaddition reactions ; 1,2-Oxaboretanes ; 1,2-Thiaboretanes ; 1,2-Azaboretidines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 217[1]. - [2 + 2] Cycloaddition Reactions of 9-Fluorenylidene(tetramethylpiperidino)borane with Carbonyl and Thiocarbonyl CompoundsAmino-9-fluorenylidene-borane 1 reacts with acetone or benzophenone in a [2 + 2] cycloaddition manner to give stable 1,2-oxaboretane derivatives 2. Aldehydes behave similarly but the oxaboretanes formed decompose readily. The esters MeCO2Et and MeC≡C - CO2Me as well as Cp(CO)2Fe - COCH3 also provide access to novel oxaboretane derivatives (2e, f, h). In contrast, no oxaboretane is obtained from 1 and MeC(O)NMe2 and only (tmpBO)n (n=2, 3) was isolated as a decomposition product. The amides MeC(O)NHMe and MeC(O)NH2 also provide no access to cycloaddition since their NH bonds insert into the BC double bond of 1. Thioketones react with 1 to yield 1,2-thiaboretanes 5. Tetramethyl-cyclobutan-1-one-3-thione 8 adds 1 at its carbonyl function regiospecifically to form 9. No reaction between 1 and CO2 was observed, but COS produces an 1,2-oxaboretane-4-thione 7, and CS2 in the form of [CpFe(CO)2]2CS2 the corresponding 1,2-thiaboretane-4-thione 10. Analogously, the ketimine Ph2C=NMe adds to 1 producing the 1,2-azaboretidine 11. X-ray structure determination of the 1,2-oxaboretane 2h reveals a butterfly structure (folding anlge: 159.9°) of the four-membered ring in contrast to the 1,2-thiaboretane 5a whose four-membered ring is almost planar, the folding angle being 176.9°.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260509
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and Structure of Organotin(IV) Complexes of Maltol (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1895-1900 
    Details
    ISSN: 0009-2940
    Keywords: Tin, diorganyl-, bis(maltolate) ; Tin, butyl-, tris(maltolate) ; Tin, tributyl-, maltolate ; Tin, dichloro-, bis(mal-tolate) ; Maltolates, tin ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of organotin(IV) maltol complexes R4  -  xSnLx (1-4, 6; x = 1-3) and the dichloro-compound Cl2SnL2 (5) have been prepared and characterized on the basis of their IR-, 1H-, 13C- and 119Sn-NMR data. While an X-ray crystal structure analysis of Ph2SnL2 (4) and Cl2SnL2 (5) reveals distorted cis-octahedral structures, the Me2SnL2 molecule (2) adopts a skew-trapezoidal bipyramidal configuration with a very significant difference in the Sn-O(keto) bond distances. The tris-maltol complex BuSnL3 (6) exhibits a distorted pentagonal-bipyramidal geometry with the butyl carbon and a hy-droxy oxygen constituting the axial orientations.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941271013
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  • 8
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 202. Borylierung von Aminosäuren mit einem Amino-imino-boran (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 953-961 
    Details
    ISSN: 0009-2940
    Keywords: N-Boryl amino acid esters ; N,N-Dimethyl amino acid boryl esters ; N-Boryl amino acid boryl esters ; 1,3,2-Oxazaborolidin-5-on derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 2021). - Borylation of Amino Acids by an Amino-imino-boraneReactions of (tert-butylimino)(2,2,6,6-tetramethylpiperidino)-borane (3) with amino acid esters or N,N-dimethyl amino acids lead to the N-borylated products 5 and boryl esters 11, respectively. Amino acids and 3 yield the O,N-bis-boryl compounds 13 and/or 1,3,2-oxazaborolidin-5-ones 14, depending on the size of the organyl substituent R at the α-carbon atom of the amino acid. Increasing the bulk of this group favours the formation of 14 with elimination of tert-butylamine. The five-membered OBNCC ring of 14 is planar according to an X-ray structure analysis of 14e. (2,6-Diisopropylphenylimino)(2,2,6,6-tetramethylpiperidino)borane reacts with amino acids similar to 3, but tetramethylpiperidine is eliminated on ring formation to produce 20. N-Monoalkyl amino acids and 3 predominantly give oxazaborolidin-5-ones.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230503
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  • 9
    Electronic Resource
    Electronic Resource
    Notizen / Notes. Investigation on the Product from Monobutyltin(IV) Compounds and Benzoyl(thiobenzoyl)methane: a 1,3,2λ5,4λ5-Dithiadistannetane (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 83-85 
    Details
    ISSN: 0009-2940
    Keywords: 1,3,2λ5,4λ5-Dithiadistannetane, 2,4-bis[benzoyl(thiobenzoyl)methanato-O,S]-2,4-dibutyl- ; Anisobidentate ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Butyltin triisopropoxide reacts with benzoyl(thiobenzoyl)methane (LH) to yield BuSn(S)L and an organic sulfide 2 instead of the expected BuSnL3. The use of other butyltin(IV) starting materials invariably leads to the same products. From an X-ray structure determination the tin sulfido complex is found to be a centrosymmetric dimer, [BuSn(S)L]2 (1) with a planar four-membered Sn2S2 ring containing pentacoordinated tin atoms.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240113
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  • 10
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 212. Azaphosphoniaborataborolidine und ihre Thermolyse zu DiazaphosphadiborinanenHerrn Professor Dr. Anton Meller zum 60. Geburtstag gewidmet. (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 2213-2222 
    Details
    ISSN: 0009-2940
    Keywords: Diborylmethanes ; Amino-imino-posphane ; Haloboration ; Phosphane borane adducts, intramolecular ; Phosphenium ion, cyclic ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 212[1]. - Azaphosphoniaborataborolidines and their Thermolysis to DiazaphosphadiborinanesMe3SiN = PN(SiMe3)2 (1) adds Lewis-acidic diborylmethanes CH2[B(Cl)X]2 (6a-d, X = Cl, Me, Ph, Mes) to yield the five-membered azaphosphoniaborataborolidines 9a-d by haloboration and formation of an intramolecular coordinative phosphorus boron bond. However, the less Lewis-acidic diborylmethane CH2[B(Cl)NMe2]2 does not react with 1. NMR studies on 9 exhibit conformational dependence of the ring system on the bulkiness of X, suggesting a decreasingly folded structure for X = Mes 〉 Ph 〉 Me and a planar ring for X = Cl, the latter proven by an X-ray structure analysis. 9 a, b rearrange their ring framework on heating with elimination of Me3SiCl to give diazaphosphadiborinanes 7. Compound 7b shows the typical reactions of a diamino(chloro)phosphane: oxidation by S8 yields the corresponding phosphane sulfide 17 while AlCl3 abstracts a chloride ion with formation of a phosphenium tetrachloroaluminate 13. In the reaction of 7b with BBr3 halogene exchange (to 16) dominates, while a phosphane borane adducts (15) is formed in a side reaction only.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921251008
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