Radical-Initiated Hydrosilylation-Cyclization Reactions of Bis(vinyldimethylsilyl) Compounds, CH2=CH(CH3)2SiXSi(CH3)2CH=CH2 (X = O, CH2, NH, NCH3, NSi(CH3)3
Dietmar SeyferthHolger B. FriedrichShane W. Krska
Abstract
The di-tert-butyl peroxide-initiated reactions of triethyl- and tri-n-propylsilane with bis-(vinyldim ethylsilyl) compounds, CH 2 =CH(CH 3 ) 2 SiXSi(CH 3 ) 2 CH=CH 2 (X-O,CH 2 , NH,NCH 3 and NSiMe 3 ) resulted in hydrosilylation-cyclization to give mixtures of trialkylsilylm ethyl-substituted disilacyclohexanes and trialkylsilylm ethyl-substituted disilacyclopentanes. The ratio of six-membered to five-membered ring products obtained is dependent on the linking group X and decreased in the order X=O>CH 2 >NH>NCH 3 . For X = NSiMe 3 only a mixture of the cis and trans isomers of the five-membered ring product was obtained.
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