Process for dicarboxylating dihydric phenols

Details Process for dicarboxylating dihydric phenols Process for dicarboxylating dihydric phenols

1998-05-01

2000-03-21

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562423, C07C 5115

Patent

active

060404787

ABSTRACT:
A process is disclosed for dicarboxylating dihydric phenols, notably those where the hydroxyl groups are in the para or the ortho position vis-a-vis one another. More particularly, the invention pertains to a process for preparing 2,5-dihydroxyterephthalic acid (2,5 DHTA). The invention comprises contacting a dihydric phenol with carbon dioxide in the presence of an alkali metal carbonate, the reaction being carried out in the presence of an alkali metal formate, at a temperature above the formate's melting point. The invention has several advantages over the well-known Kolbe-Schmitt reaction and other known carboxylation reactions, such as a lower operating pressure, higher yields, and/or shorter reaction times.

REFERENCES:
patent: 2816137 (1957-12-01), Clemens, Jr.
patent: 3448145 (1969-06-01), Zorn et al.
patent: 3646131 (1972-02-01), Ikarasi
patent: 3655744 (1972-04-01), Yasuhara et al.
Derwent Patent Abstract 48885S-E (1971).
Derwent Patent Abstract 91-328591/45 (1991).
Derwent Patent Abstract 28893R (1970).
A.S. Lindsey et al., "The Kolbe-Schmitt Reaction", Chemical Reviews, vol. 57, pp. 583-620 (1957).
T.S. Gore et al., "Synthesis of Resorcinol-4, 6-& 2,4-Dicarboxylic Acids", Indian Journal of Chemistry, vol. 12, Sep. 1974, pp. 946-947.

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