triphenylphosphine in tetrachloromethane 22 h; Heating;

1: 89 percent / p-toluenesulfonic acid / benzene / 11 h / Heating 2: ozone / diethyl ether / 2 h / -78 °C 3: LiAlH4 / diethyl ether / 2 h / Ambient temperature 4: 89 percent / triphenylphosphine / CCl4 / 22 h / Heating View Scheme

1: ozone / diethyl ether / 2 h / -78 °C 2: LiAlH4 / diethyl ether / 2 h / Ambient temperature 3: 89 percent / triphenylphosphine / CCl4 / 22 h / Heating View Scheme