1: With tert.-butyl lithium in tetrahydrofuran; pentane T=-78 - 20°C; 2: With hydrogenchloride in tetrahydrofuran; pentane T=70°C; 12 h;

palladium diacetate; triphenylphosphine in N,N-dimethyl-formamide T=90°C; 1.5 h; Inert atmosphere;