carbon monoxide; palladium on activated charcoal; 1,4-di(diphenylphosphino)-butane in ethylene glycol dimethyl ether T=150°C; P=5168 Torr; 24 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

carbon monoxide; palladium on activated charcoal; 1,4-di(diphenylphosphino)-butane in ethylene glycol dimethyl ether T=150°C; P=30400 Torr; 24 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

dimethylsulfide; ozone 1) MeOH, CH2Cl2, -78 deg C, 2) to RT; Yield given. Multistep reaction;