1: 7-methyl--3-methylen-1,6-octadiene With titanium(IV) isopropylate; isopropylmagnesium chloride in tetrahydrofuran T=-78 - 0°C; 2: propionic acid ethyl ester in tetrahydrofuran T=-40 - 20°C;

in tetrahydrofuran Mg rod electrodes, LiClO4, molecular sieves 5A, 4F/mol of electricity;