Method for making tris(hydroxyphenyl) compounds using ion exchange resins
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United States of America Patent
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Oct 19, 1999
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app pub date -
Oct 17, 1997
filing date -
Sep 29, 1995
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Abstract
An improved method for the preparation of tris(4-hydroxyphenyl) compounds is provided. In particular, an improved method for preparing 1, 1, 1-tris(4'-hydroxyphenyl)ethane is provided which comprises heating a mixture comprising phenol and 4-hydroxy acetophenone in the presence of effective amounts of an ion exchange catalyst and a mercaptan as a copromoter such that the resulting 1, 1, 1-tris(4'-hydroxyphenyl)ethane is substantially free of various reaction impurities.
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