Method for producing 3,5-di-tert-butyl-4-hydroxybenzoic acid
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United States of America Patent
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Sep 5, 2006
Grant Date -
Dec 1, 2005
app pub date -
May 31, 2005
filing date -
May 28, 2004
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Expired
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Abstract
The present invention provides a method for producing 3,5-di-tert-butyl-4-hydroxybenzoic acid comprising: (1) providing 2,6-di-tert-butylphenol which may contain up to 0.5% by weight of 3,3',5,5'-tetra-tert-butyl-4,4'-dihydroxybiphenyl; (2) reacting a basic alkali metal compound with an excess amount of the 2,6-di-tert-butylphenol, which is in excess of the basic alkali metal compound, to give the alkali metal 2,6-di-tert-butylphenolate; and (3) reacting the alkali metal 2,6-di-tert-butylphenolate obtained in step (2) with carbon dioxide to give 3,5-di-tert-butyl-4-hydroxybenzoic acid. According to the method of the present invention, 3,5-di-tert-butyl-4-hydroxybenzoic acid can be obtained with high and stable yield.
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