Abstract The 1 (Z), 4 (Z)-1, 5-dilithium-3R-3-methoxypenta-1, 4-dienes, available by cleavage of 1, 1-di-n-butyl-4R-4-methoxy-1-stannacyclohexane-2, 5-dienes with n-BuLi in ether, react with dichlorosilanes (R′ R ″SiCl 2; R′, R ″= H, alkyl, aryl, alkoxy) to give 1R′, 1R ″, 4R-4-methoxy-1-silacyclohexa-2, 5-dienes.