ISSN:
0009-2940
Keywords:
Silylgallanes
;
Gallium compounds
;
Hydroxygallium compounds
;
Gallium alkoxides
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Reaction of lithium tris(trimethylsilyl)silanide · 3 THF with R2GaCl (R = 2,2,6,6-tetramethylpiperidino, Me, Cl) yields tmp2GaSi(SiMe3)3 (3) and R2Ga(THF)Si(SiMe3)3 (R = Me, Cl) (7, 9). Both gallium nitrogen bonds in 3 are cleaved by protic reagents. Depending on the acidity of these agents, either oligomeric gallanes [(RO)2GaSi(SiMe3)3]n (R = Et, H, n = 2, 3) (11, 12) or tetramethylpiperidinium gallates [X3GaSi-(SiMe3)3]- (X = OPh, Cl) (13, 14) are formed. Hydroxide 11 adds lithium hydroxide to afford the mixed lithium gallium hydroxide 15. Single-crystal X-ray diffraction studies confirm the suggested constitutions. The gallium-silicon bond can adopt values between 236 and 247 pm. Here electronic influences of the substituents on the gallium center are of great importance as well as their steric demand. This is underlined by quantum chemical calculations on the ab initio (SCF) level.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19961290514
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