1: 4-bromo-benzylamine hydrochloride With tert.-butyl lithium; isopropylmagnesium chloride in tetrahydrofuran; diethyl ether; pentane T=-78°C; 0.5 h; 2: With sulfur in tetrahydrofuran; diethyl ether; pentane T=-78 - 20°C; 0.5 h; 3: benzyl bromide in tetrahydrofuran; diethyl ether; pentane