ω-Ethoxycarbonyl-, ω,ω-bis(ethoxycarbonyl)- and ω-(ethoxycarbonyl)-ω-cyanoalkyltrialkoxysilanes

(Chloroalkyl)trialkoxysilanes react with sodium ethyl malonate and sodium ethyl cyanoacetate to give the corresponding ω-(ethoxycarbonyl)alkyltrialkoxysilanes, while the reaction of sodium ethyl acetoacetate with (chloromethyl)triethoxysilane gives ethyl (triethoxysilyl)-propionate.