aluminium; mercury dichloride Inert atmosphere;

1: 3-methyl-1,2-butadiene With n-butyllithium in tetrahydrofuran; hexane T=-60°C; 0.5 h; Inert atmosphere; 2: formaldehyd With zinc(II) chloride in tetrahydrofuran; hexane 0.5 h; Inert atmosphere;