T=180 - 200°C; 3 h;

T=168°C;

potassium hydride in cyclohexane 3 h; Heating;

lithium hexamethyldisilazane in tetrahydrofuran 1.) -78 deg C, 30 min, 2.) -78 deg C, 3 h;

1: With lithium hexamethyldisilazane in tetrahydrofuran T=-78°C; Metallation; 0.25 h; 2: With copper(ll) bromide in tetrahydrofuran T=-78 - 20°C; Dimerization; bromination; Title compound not separated from byproducts;