Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 5, 2006
Patent Application Number
11139636
Date Filed
May 31, 2005
Patent Primary Examiner
Patent 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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