1: I2 / Zn-Cu / diethyl ether 2: aq. HCl / methanol View Scheme

1: With Cp2HfCl2 in dichloromethane T=-78 - 23°C; 2: With potassium hydroxide; N-benzyl-N,N,N-triethylammonium chloride in dichloromethane; water T=0 - 23°C;