Twelve borosilicates with the general formula O-Y-O-B-O-(SiPh2O)(n)-Br-O-Y-O (where n = 1, 2, 3 or 4; Y = one of the organic groups CMe2CMe2, CMe2CH2CHMe, CMe2CH2CMe2 or CHPr'CMe2CH2) were prepared. Three synthetic routes were investigated, including a one-pot self-assembly reaction of two equivalents each of boric acid, silanediol and organic diol. The probable sequence for this reaction is discussed. The borosilicates were either solids or viscous liquids and were colourless. They formed cyclosiloxane species when thermally decomposed or reacted with either water or potassium trimethylsilanolate. They were unreactive to triethylamine, di-iso-propylamine, pyridine or ethylenediamine. The di-tert-butyl species (O-CMe2CH2CHMe-O-B-O)(2)SiBu2t was prepared and structurally characterised using X-ray techniques. The parameters associated with the B-O-Si bonds were a B-O-Si angle of 141.5(2)degrees and B-O and Si-O distances of 1.360(4) and 1.625(2) Angstrom, respectively. (C) 1999 Elsevier Science Ltd. All rights reserved.
A new highly selective method for the synthesis of borasiloxanes through the O-borylation of silanols, disilanols, and disiloxanediols with vinylboronates in the presence of Ru0 complexes (mainly Ru3CO12) is described. The method leads to the formation of special compounds with a B–O–Si inorganic framework. When Ru0 complexes are used as a catalyst, no vinylboronate homocoupling is observed. A mechanism
Ruthenium-catalysed multicomponent synthesis of borasiloxanes
作者:Basujit Chatterjee、Chidambaram Gunanathan
DOI:10.1039/c7cc00787f
日期:——
We present the selective atom economical synthesis of borasiloxanes using a multi-component approach directly from the one-pot ruthenium catalysed reaction of boranes, silanes and water
Chemoselective and Catalyst-Free O-Borylation of Silanols: A Facile Access to Borasiloxanes
作者:K. Kuciński、G. Hreczycho
DOI:10.1002/cssc.201701648
日期:2017.12.8
highly chemoselective syntheses of various borasiloxanes from hydroboranes and silanols, achieved through catalyst‐free dehydrogenative coupling at room temperature. This green protocol, which uses easily accessible reagents, allows for the obtaining of borasiloxanes under air atmosphere and solvent‐free conditions.
A convenient and clean synthetic method for borasiloxanes by Pd-catalysed reaction of silanols with diborons
作者:Aya Yoshimura、Michiyo Yoshinaga、Hiroshi Yamashita、Masayasu Igarashi、Shigeru Shimada、Kazuhiko Sato
DOI:10.1039/c7cc02420g
日期:——
Selective O-borylation of silanols with diborons took place in the presence of Pd catalysts to give the corresponding boryl silylethers in high yields.