Process to prepare polyhalodiphenyl carbonates

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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C07C 6802

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041029127

ABSTRACT:
An improvement in the process of preparing a polyhalodiphenyl carbonate containing 6-10 halogen atoms from a reaction in a basic aqueous medium of a polyhalophenol and a carbonate precursor in the presence of a suitable catalyst, the improvement comprising reacting the components at a pH above about 10.5 in the presence of a solvent in which the polyhalodiphenyl carbonate is essentially insoluble and in which color bodies associated with polyhalophenol are soluble and retained. The improved process produces a polyhalodiphenyl carbonate which is essentially colorless and which possesses a low residual chloride content.

REFERENCES:
patent: 3017424 (1962-01-01), Meyer et al.
patent: 3275674 (1966-09-01), Bottenbruch et al.
patent: 4016190 (1977-04-01), Bockmann et al.

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