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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Contributions to the Chemistry of Boron, 227Part 226: Ref.. The P-centered Chemistry of [(Di-tert-butylphosphanyl)imino]-(2,2,6,6-tetramethylpiperidino)boraneDedicated to Professor Helmut Werner on the occasion of his 60th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 205-212 
    Details
    ISSN: 0009-2940
    Keywords: Borane, [(di-tert-butylphosphanyl)imino](2,2,6,6-tetramethylpiperidino) dimer ; Phosphonium, di-tert-butylmethyl[(2,2,6,6-tetramethylpiperidinoborylene)imino]iodide ; Haloboration ; Hydroboration ; Metal carbonyl complexes of [(di-tert-butylphosphanyl)imino](2,2,6,6-tetramethylpiperidino)borane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The elements oxygen, sulfur, and selenium add to the P atom of the title borane 1. In contrast to the formation of tmp—B≡N—P(X)tBu2 (X = S, Se), the P oxide (X = O) dimerizes to [tmp—B≡N—P(O)tBu2]2 (5) with an eight-membered flat boat-shaped B2N2P2O2 ring. Borane 1 reacts readily with Mel to yield a phosphonium salt 8 and with BBr3 to give an adduct 9 with a B—P bond. In contrast, bis(dichloroboryl)-methane not only adds to 1 to generate a coordinate B—P bond but also chloroborates the B≡N triple bond, the final product being a new five-membered heterocycle 10. Similarly, the BH3 component of BH3·SMe2 first adds to the P atom of 1 followed by reaction of a second mol of BH3·SMe2 which hydroborates the B≡N triple bond. Finally, metal carbonyl fragments add only to the P atom of 1, demonstrating also that the chemistry of the molecule 1 is dominated by the basicity of its P center.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280302
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  • 3
    Electronic Resource
    Electronic Resource
    Chemistry of Diborane(4) Derivatives: Mixed Tetraaminodiboranes(4) and Additions of Diborane(4) Derivatives to an Amino-imino-borane (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1605-1611 
    Details
    ISSN: 0009-2940
    Keywords: Diborane(4), tetraamino-, derivatives ; Diborane(4), tetrapiperidino ; 1,2,3,6-Diazadiborinane derivatives ; Haloboration ; Methoxyboration ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several transamination reactions of B2(NMe2)4 (1a) with secondary amines have led to mixed tetraaminodiborane(4) compounds B2(NMe2)4 - n(NR2)n (2-4), and B2(NC5H10)4 (1d) has been characterized by an X-ray structure analysis which reveals the presence of a rather long B-B bond (1.75 Å). However, tetraaminodiboranes(4) of type R2N(Me2N)B-B(NMe2)NR2 are more readily accessible from LiNR2 and B2(NMe2)2Cl2. Similarly, amination of B2(NMe2)2Cl2 with N,N'-dimethylethylenediamine (7) yields B-[bis(dimethyl-amino)boryl]-N,N'-dimethyl-1,3,2-diazaborolidine (8), while reactions with Li(Me)N-CH2-CH2-N(Me)Li (9) lead also to 2,3-bis(dimethylamino)-1,4-dimethyl-1,4,2,3-diazadiborinane (10) as the kinetically controlled product. This is further substantiated by the reaction of the B2(NMe2)2Br2 with 9 which gives exclusively the corresponding 1,4,2,3-diazadiborinane 11. Diborane(4) dihalides B2(NMe2)2X2 (X = Cl, Br) react only in a 1:1 ratio with tmp-B=N-CMe3 (13) leading to 14a, b. However, both a 1:1 and a 1:2 methoxyboration of 13 has been observed with B2(OMe)4 with formation of 15 and 16.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270909
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