1: 2-(Diethoxy-phosphoryl)-propionic acid ethyl ester With lithium tert-butylate in hexane T=25°C; 0.25 h; 2: 2-Methyl-3-ethylacrolein in hexane T=25°C; Horner-Wadsworth-Emmons reaction; 1 h;

in tetrahydrofuran 48 h; Heating;

Wittig reaction;