1: 1) Mg, 2) PCl3 / 2) THF, hexane, -78 deg C 2: 1) AlCl3, 2) tributylphosphine / 1) CH2Cl2, -78 deg C, 15 min, 2) -78 deg C to r.t. View Scheme

aluminium trichloride; tributylphosphine 1) CH2Cl2, -78 deg C, 15 min, 2) -78 deg C to r.t.; Yield given. Multistep reaction;