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PREPARATION OF TETRAKIS 33 3*55DIBUTYLL44HYDROXYPHENYL PROPIONYLOXYMETHYL METHANE
PREPARATION OF TETRAKIS 33 3*55DIBUTYLL44HYDROXYPHENYL PROPIONYLOXYMETHYL METHANE
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机译:四(四甲基)33 3 * 55二丁基乙氧基丙基丙氧基甲烷甲烷的制备
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摘要
PURPOSE:To obtain the titled compound, useful as an antioxidant, in high yield, by the reaction of the corresponding propionic acid ester and monopentaerythritol in the presence of dipentaerythritol. CONSTITUTION:The titled compound of formula II is obtained by the ester exchange reaction of a propionic acid ester of formula I (R is methyl or ethyl) and monopentaerythritol in the presence of dipentaerythritol of formula III in an amount of 0.1-1wt% of pentaerythritol. The amount of the trisubstituted side product of pentaerythritol can be decreased to =5%, and the high purity objective compound of formula II can be obtained by simple recrystallization.
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