Hydroboration of alkyn-1-yl(methyl)silanes bearing functional substituents at silicon
作者:Bernd Wrackmeyer、Heidi E Maisel、Wolfgang Milius、Moazzam H Bhatti、Saqib Ali
DOI:10.1016/s0022-328x(02)02219-2
日期:2003.3
Alkyn-1-yl(methyl)silanes Me-2(H)Si-Cequivalent toC-R (1), Me(H)(Cl)Si-Cequivalent toC-R (2) and Me-2(Cl)Si-Cequivalent toC-R (3) [R = Bu (a), Bu-t (b), Ph (c), SiMe3 (d)] react with 9-borabicyclo[3.3.1]nonane (9-BBN) by 1,2-cis-hydroboration to give selectively (except of 3d) the alkenylsilanes 4 (from 1), 5 (from 2), and 6 (from 3), in which the boryl group has become attached to the carbon atom adjacent to the silyl group bearing functional substituents. In the case of 3d, a mixture consisting of the alkenes 6d and the isomers 7d, 8d and 9d is obtained. All products were characterised by NMR spectra (H-1-, B-11-, C-13 and Si-29-NMR) in solution, and in the cases of 5c and 6c, the molecular structures in the solid state were determined by X-ray analysis. (C) 2003 Elsevier Science B.V. All rights reserved.