Dodecamethylcyclohexasilethene (Me(2)SiCH=CH)(6) (1) was synthesized by autohydrosilylation of HMe(2)SiC=CH in a tetrahydrofuran solution in the presence of H2PtCl6 under high dilution. An analogous reaction of Me(2)Si(C=CH)(2) or E-HC=CMe(2)SiCH=CHSiMe(2)C=CH with E,E-Me(2)Si(CH=CHSiMe(2)H)2 gave octamethylcyclotetrasilethene (Me(2)SiCH=CH)(4) (2) and decamethylcyclopentasilethene (Me(2)SiCH=CH)(5) (3) respectively. The X-ray structure of 3 is presented.