(3-chloropropyl)diphenylarsine; sulfur dioxide; potassium iodide; lithium diisopropyl amide 1)THF, Et2O, hexane, -25 deg C, 2) CHCl3; Yield given. Multistep reaction;

sulfur dioxide; potassium iodide; lithium diisopropyl amide 1) THF, Et2O, hexane, -25 deg C, 12 h, 2) CHCl3; Yield given. Multistep reaction. Yields of byproduct given;