Regio- and Stereoselective Approach to 1,2-Di- and 1,1,2-Trisilylethenes by Cobalt-Mediated Reaction of Silyl-Substituted Dibromomethanes with Silylmethylmagnesium Reagents


  • This work was supported by Grants-in-Aid for Scientific Research for Young Scientists and COE Research from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.


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Functional ethenes: Treatment of dibromo(silyl)methanes 2 a with silylmethyl Grignard reagents 1 and catalytic CoCl2 affords (E)-1,2-disilylethenes 3 a in excellent yields. Dibromodisilylmethanes 2 b undergo a similar transformation to furnish trisilylethenes 3 b with excellent stereo- and regioselectivity in the presence of a stoichiometric amount of a cobaltate reagent.