Method for preparing hydroquinone and hydroquinone-bisphenol a B

Details Method for preparing hydroquinone and hydroquinone-bisphenol a B Method for preparing hydroquinone and hydroquinone-bisphenol a B

1989-01-19

1990-11-27

Garner, Vivian

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

Organic compounds

Halocarbonate esters

528370, 528372, 558268, C07C 6802, C07C 6996

Patent

active

049737295

ABSTRACT:
Bischloroformates of bisphenol compositions comprising hydroquinone or a hydroquinone-bisphenol A mixture are prepared by passing phosgene into a vigorously agitated mixture of water, an alkaline earth metal hydroxide, the bisphenols and a substantially inert, water-immiscible organic liquid such as methylene chloride. The molar ratio of water to alkaline earth metal hydroxide is in the range of about 3-8:1. The bisphenols and at least a portion of the organic liquid are preferably initially present in the reaction mixture, and the alkaline earth metal hydroxide is preferably added during phosgenation.

REFERENCES:
patent: 4638077 (1987-01-01), Brunelle et al.

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