FIELD: organic chemistry. SUBSTANCE: compounds of the general formula 4-MeOC6H4P(S)(SER3)(XR′), wherein R, R′ each independently is lower alkyl, E is Si, Sn, X is oxygen, sulfur, are prepared by reacting 4-MeOC6H4P(S)-S-P(S)(C6H4OMe-4)-S with 2:R3EXR′, wherein R, R′, E, and X as defined above, at temperature of 15-20 C. EFFECT: increased yield of the end product.
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