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, 162. The Reaction of Hydrogen Chloride with (tert-Butylimino)(tetramethylpiperidino)borane and its Diazadiboretidine DimerHydrogen chloride adds to the amino-imino-borane 1 to give tmpB(Cl)NHC(CH3)3 (3) (tmp = 2,2,6,6-tetramethylpiperidino group), which is also the first product to be isolated in the reaction of HCl with [tmp-B = NC(CH3)3]2 (2). Further interaction leads to the salt tmpHBC[NH-C(CH3)3]Cl (7c), which reacts with HCl to finally yield [tmpH2]Cl. Aminolysis of tmpBCl2 (9) with tert-butylamine produces no diazadiboretidine 2 but 3 and tmpB[NHC(CH3)3]2 (10). - The X-ray structure analysis of 2 (monoclinic, P21/n, Z = 2) reveals a point group symmetry Ci for this molecule. Its planar B2N2 four-membered ring has the shape of a slightly diamond distorted square. The tmp groups are almost orthogonally oriented towards the B2N2 ring. All BN bond lengths are equal (BN 146.7 pm).
Notes:
Chlorwasserstoff addiert sich an das Amino-imino-boran 1 zu tmpB(Cl)NHC(CH3)3 (3) (tmp = 2,2,6,6-Tetramethylpiperidino-Gruppe), das auch das erste faßbare Produkt der Einwirkung von HCl auf [tmp-B=NC(CH3)3]2 (2) ist. Die weitere Umsetzung führt zum Salz tmpHBC[NH-C(CH3)3]Cl (7c), das mit HCl letztlich zu [tmpH2]Cl weiterreagiert. Die Aminolyse von tmpBCl2 (9) mit tert-Butylamin liefert kein Diazadiboretidin 2, sondern 3 und tmpB[NHC(CH3)3]2 (10). - Nach der Röntgenstrukturanalyse besitzt 2 (monoklin, P21/n, Z = 2) die Symmetrie der Punktgruppe Ci. Der planare B2N2-Vierring ist schwach rautenförmig gebaut. Die tmp-Gruppe steht fast orthogonal zum Vierring. Alle BN-Abstände sind gleich lang (BN 146.7 pm).
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19851181207
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