Abstract Mixtures of alkyl esters of 2-triethylsilyl (germyl)-and (E)-3-triethylsilyl (germyl) acrylic acids were obtained by hydrosilylation and hydrogermylation of alkyl esters of propiolic acids. Alkyl esters of organosilicon (germanium) β-amino (hydrazino) propionic acids were obtained by amination of the alkyl esters of 2-triethylsilyl (germyl) acrylic acids.