1: 4-tert-butyl-2',3'-bis(chloromethyl)biphenyl With magnesium-anthracene in tetrahydrofuran T=0 - 20°C; 1 h; 2: methyl acetate in tetrahydrofuran T=0 - 20°C; 3: With toluene-4-sulfonic acid in toluene 1.5 h; Heating / reflux;

1: 4-tert-butyl-2',3'-bis(chloromethyl)biphenyl With magnesium; ethylene dibromide in tetrahydrofuran T=20°C; 2: methyl acetate in tetrahydrofuran T=-78 - 0°C; 3 h;