1: 2-methoxybromobenzene With sec.-butyllithium in diethyl ether T=0°C; 1 h; Inert atmosphere; 2: (R(P),R(P))-1,2-bis[(methoxy)(phenyl)phosphino-P-borane]ethane in tetrahydrofuran; diethyl ether T=-78 - 20°C; Inert atmosphere;