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The 1,1-ethylboration of dichloro(hexyn-1-yl)silane, Cl 2  Si(H)-C≡C-Bu, affords selectively an alkene which is the first example with dialkylboryl and dichlorosilyl groups in cis-positions at the C=C bond. The analogous reaction of dichloro( trimethylsilylethynyl)silane, Cl 2 (H)Si-C≡C-Si Me 3 , leads to a 4:1 mixture of alkenes, in one of which the boryl and dichlorosilyl groups are in trans-positions. The alkenes were characterized by a consistent set of NMR data.

1,1-Ethylboration of Alkyn-1-yl- (dichloro)silanes: Alkenes Bearing Dichlorosilyl and Diethylboryl Groups