Hydrosilylation of 2-(2-Propynyl)-2,3-dihydro-1,2-benzothiazol-3-one 1,1-Dioxide with 1-Alkynyl(dimethyl)- and Bis(1-alkynyl)methylsilanes
作者:G. S. Lyashenko、D. V. Dmitriev、I. A. Yazovtsev、M. M. Demina、A. I. Albanov、A. S. Medvedeva
DOI:10.1023/b:rujo.0000010569.52018.04
日期:2003.10
Hydrosilylation of 2-(2-propynyl)-2,3-dihydro-1,2-benzothiazol-3-one 1,1-dioxide with 1-alkynyldimethyl- and bis(1-alkynyl)methylsilanes of the general formula MenHSi(Cequivalent toCR)(3-n) (n = 1, 2) in the presence of H2PtCl6 (Speier's catalyst) occurs in a nonregioselective but stereoselective fashion, yielding mixtures of the corresponding trans-beta- and alpha-adducts. The fraction of the latter ranges from 50 to 70%, depending mainly on the substrate nature rather than on the nature of substituent at the triple bond of the reagent.
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作者:G. S. Lyashenko、A. S. Medvedeva、I. A. Yazovtsev、A. I. Albanov、M. M. Demina
DOI:10.1023/a:1015586210217
日期:——
The hydrosilylation of a number of acetylenes RCdropCH (R, R' = Ph, CH2OPh, CH2SPh) with alpha-ethynylhydrosilanes Me(2)SiHCHdropCR' in the presence of H2PtCl6 was investigated. The addition did not occur regioselectively, but was stereospecific and afforded a mixture of alpha- and trans-beta-adducts. The replacement of phenyl substituent by phenoxymethyl both in the molecule of ethynylsilane and the acetylene substrate resulted in growing proportion of the a-adduct in the reaction mixture up to 10-60%.