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Preparation and Structural Characterization of Lithium Silylborates

✍ Scribed by Wolfgang Lippert; Heinrich Nöth; Werner Ponikwar; Thomas Seifert

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
291 KB
Volume
1999
Category
Article
ISSN
1434-1948

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✦ Synopsis

Lithium (triphenylsilyl)

trihydridoborate / Lithium (tert-butyldiphenylsilyl)trihydridoborate / Lithium tris(trimethylsilyl)methylborate / Lithium tetrakis(trimethylsilyl)borate / X-ray structure analysis Borane triethylamine reacts with lithium triphenylsilanide or silanide to form lithium tetrakis(trimethylsilyl)borate 3 and lithium tris(trimethylsilyl)methylborate 4. Mixed single lithium tert-butyldiphenylsilanide with formation of lithium (triphenylsilyl)trihydridoborate or lithium (tert-butyldiphen-crystals of 3 and 4 show an unexpected coordination of the lithium cation due to the lack of any supporting donor ylsilyl)trihydridoborate. Complexation of the lithium cation with various ligands allows the isolation of compounds 1, 2a, molecule. All silylborates exhibit short Si-B bond lengths compared to tricoordinated silylboranes. and 2b. Trimethoxyborane reacts with lithium trimethylalkali metal silanides, MSiR 3 , with BH 3 • THF as the [ ] Part 243: Ref. [1] solution containing NEt 3 .

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