Method for producing 3,5-di-tert-butyl-4-hydroxybenzoic acid

Details Method for producing 3,5-di-tert-butyl-4-hydroxybenzoic acid Method for producing 3,5-di-tert-butyl-4-hydroxybenzoic acid

2006-09-05

2006-09-05

Zucker, Paul A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

Reexamination Certificate

active

07102028

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.

REFERENCES:
patent: 0834494 (1998-04-01), None
patent: 1219205 (1971-01-01), None
patent: WO 2004/031113 (2004-04-01), None
patent: WO 2004/078693 (2004-09-01), None
patent: WO 2004/031113 (2004-04-01), None
patent: WO 2004/078693 (2004-09-01), None
CAS Abstract of Ueno, Ryuzo et al: “Process for production of hydroxybenzoic acids”, STN Database accession No. 2004:756668 for WO 2004/078693 A1 (Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo) Sep. 16, 2004.
CAS Abstract of Ueno, Ryuzo et al: “Process for preparation of hydroxybenzoic acids”, STN Database accession No. 2004:308393 for WO 2004/031113 A1 (Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo) Apr. 15, 2004.

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