Abstract
Abstract A chloromethylation of O,O-diethyl phosphorodithioic acid (1) was effected by a two step procedure. The first step involved the preparation of the hydroxymethyl derivative by reaction of 1 with formaldehyde and hydrogen chloride to give 3. The hydroxymethyl intermediate 3 was converted to S-(chloromethyl) O,O-diethyl phosphorodithioate 2 in high yields by using PCl5 or PCl3 in combination with ZnCl2 and/or HCl catalyst.
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