triphenylphosphine; zinc in dichloromethane; N,N-dimethyl-formamide 48 h; Ambient temperature;

1: 51 percent / AgNO3, potassium persulfate / H2O / 3 h / 30 - 40 °C 2: 65 percent / PPh3, Zn dust / CH2Cl2; dimethylformamide / 48 h / Ambient temperature View Scheme

sodium tert-pentoxide in N,N-dimethyl-formamide T=-10°C; 2 h;