Process for the recovery of dihydroxybiaryl compounds
AssigneeGeneral Electric Company
InventorsJohn Yaw Ofori, Ben Purushotam Patel, Eric James Pressman
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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.
Claims24
A method for preparing a dihydroxybiaryl compound comprising:
- (a) providing an alkali metal salt of said dihydroxybiaryl compound;
- and
- (b) contacting said alkali metal salt of said dihydroxybiaryl compound with a corresponding monohydroxyaryl halide compound.
A method for isolating a dihydroxybiaryl compound comprising:
- (a) providing an alkali metal salt of said dihydroxybiaryl compound;
- (b) contacting said alkali metal salt of said dihydroxybiaryl compound with a corresponding monohydroxyaryl halide compound to form a precipitate in a solution;
- and
- (c) separating said precipitate from said solution, wherein said precipitate comprises said dihydroxybiaryl compound.
Dependencies are inferred from the claim text.