The Treatment of Some Cyclic Thiocarbonates With Methyl Halide/Propylene Oxide

Treatment of thiocarbonates (OCSO) with methyl iodidelpropylene oxide at 80º can lead smoothly to the carbonate. In some cases, a competing process is the formation of iodo thiocarbonates ( OCOSMe ), and an explanation is provided for the product distributions observed. The corresponding reactions with methyl bromide and methyl chloride (as methyl chloroformate ) are much less efficient.