The literature on the reaction of halothiolacetates and trialkyl phosphites has been confusing. As early as 1951, S-ethyl,'S2 S-carbethoxymethyl, S-phenyl, and other S-aryl trichlorothiolacetates2 with triethyl phosphite were claimed to give phosphonates. Me1'- nikov, et al., a, 4 claimed the phosphonate structure for the products from ethyl, p- chlorophenyl, and 2, 4, 5-trichlorophenyl chlorothiolacetates similar to the products ...