Process for the recovery of dihydroxybiaryl compounds

Details Process for the recovery of dihydroxybiaryl compounds Process for the recovery of dihydroxybiaryl compounds

2006-02-21

2006-02-21

Shippen, Michael L. (Department: 1621)

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

Organic compounds

Oxygen containing

Reexamination Certificate

active

07002046

ABSTRACT:
A method for preparing and isolating dihydroxybiaryl compounds, such as 4,4′-dihydroxybiphenyl, is disclosed. The alkali metal salt of the dihydroxybiaryl compound is protonated with the monohydroxyaryl halide compound initially used in the reductive coupling reaction which produced the alkali metal salt. In addition, the alkali metal salt of the monohydroxyaryl halide compound is produced by the process, which can then be recycled as the base and monohydroxyaryl halide in a further reductive coupling reaction to form the alkali metal salt of the dihydroxybiaryl compound.

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Abstarct of JP 01-224,330 (1989).
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M. Bush et al, “Formation of Carbon Chains in the Catalytic Reduction of Alkyl Halogen Compounds”;J. Prakt. Chem. 146, 1-55 (1936) (and English abstract), No Translation.
M Busch and W. Schmidt, “Catalytic Hydrogenation of Organic Halogen Compounds”;Chemische Berichte. 62, 2612-2620 (1929) (and English abstract), No Translation.

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