FIELD: chemical technology.
SUBSTANCE: invention describes a method for synthesis of pentaerythritol diphosphites with the high content of spiro-isomer. Pentaerythritol diphosphites are synthesized by a successive re-esterification method in the presence of monophosphite, and then in the presence of substituted phenol or other alcohol, and wherein indicated reactions of re-esterification are carried out under conditions of controlled temperature and pressure. The reaction conditions provide to synthesize intermediate derivative and final pentaerythritol diphosphite with the high content of spiro-isomer and the high total yield of diphosphites.
EFFECT: improved method of synthesis.
26 cl, 1 ex
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