triphenylphosphine in benzene T=20°C; 24 h;

1: With triphenylphosphine in benzene T=20°C; 24 h; 2: With sodium metaborate; dihydrogen peroxide in acetic acid T=80°C; 5 h; Title compound not separated from byproducts;

1.1: 53 percent / PPh3 / benzene / 24 h / 20 °C 2.1: NaBO2*H2O2*3H2O / acetic acid / 5 h / 80 °C 2.2: 136 mg / POCl3 / 6 h / Heating View Scheme

1: 23 percent / PPh3 / benzene / 24 h / 20 °C 2: 67 percent / NaBO2*H2O2*3H2O / acetic acid / 5 h / 80 °C 3: 89 percent / POCl3 / 6 h / Heating View Scheme