1: (3Z,6Z)-3,6-hexadecadienyltriphenylphosphonium bromide With sodium hexamethyldisilazane in tetrahydrofuran T=-75°C; Wittig cis-olefination; 2: acrolein in tetrahydrofuran Wittig cis-olefination; stereoselective reaction;

1: (3Z,6Z)-3,6-hexadecadienyltriphenylphosphonium bromide With n-butyllithium in tetrahydrofuran; diethyl ether; hexane T=-70°C; Wittig trans-olefination; 0.333333 h; 2: acrolein in tetrahydrofuran; diethyl ether; hexane Wittig trans-olefination; 0.5 h; optical yield given as percent destereoselective reactionFurther stages;