1: With 1,1'-bis-(diphenylphosphino)ferrocene; palladium diacetate; N-ethyl-N,N-diisopropylamine in N,N-dimethyl-formamide T=80 - 90°C; 3.5 h; Inert atmosphere; 2: With hydrogenchloride in water pH=Ca. 4 - 6;