1: (Z)-7,11-dimethyl-6,10-dodecadien-2-yn-1-ol With bis(cyclopentadienyl)titanium dichloride; chloro-(2-methylpropyl)magnesium in diethyl ether T=0 - 23°C; 2 h; 2: methyl iodide in tetrahydrofuran T=0 - 23°C; 2 h; Further stages.;