Process for the preparation of 4,4'-dihydroxydiphenyl ether

Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing

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C07C 4109, C07C 4140, C07C 43295

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046754571

ABSTRACT:
The invention relates to a process for the preparation of 4,4'-dihydroxydiphenyl ether by dehydration of hydroquinone using sulfonic acids or sulfuric acid as catalysts at elevated temperatures. The dehydration product is stirred with an excess of water at 80.degree. to 110.degree. C. The higher condensed byproducts which are undissolved during this are separated off, and the ether desired is allowed to crystallize out of the filtrate obtained.

REFERENCES:
patent: 2739171 (1956-03-01), Linn
patent: 3236809 (1966-02-01), Goldberg et al.
patent: 3290386 (1966-12-01), Stamatoff
patent: 3375297 (1968-03-01), Barth et al.
patent: 3886218 (1975-05-01), Biller et al.

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