(i) Li, Et2O, (ii) /BRN= 1855121/; Multistep reaction;

1: (Z)-1-bromonon-1-ene With magnesium in tetrahydrofuran; ethylene dibromide T=5 - 20°C; Inert atmosphere; 2: 2-methyl-1-propenylmagnesium bromide With oxygen; lithium chloride; manganese (II) chloride in tetrahydrofuran T=-60°C; Inert atmosphere; optical yield given as percent de;

18-crown-6 ether; potassium tert-butylate in Petroleum ether T=25°C; 2 h;