Bischoloroformate preparation method with phosgene removal and m

Details Bischoloroformate preparation method with phosgene removal and m Bischoloroformate preparation method with phosgene removal and m

1988-07-25

1990-02-27

Garner, Vivian

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

Organic compounds

Halocarbonate esters

544347, 549 16, 549 54, 549308, 549359, 549466, 548440, C07C 6802, C07C 6996

Patent

active

049048104

ABSTRACT:
Aqueous bischloroformates are prepared by the reaction of a dihydroxyaromatic compound (e.g., bisphenol A) with phosgene in a substantially inert organic liquid (e.g., methylene chloride) and in the presence of an aqueous alkali metal or alkaline earth metal base, at a pH below about 8. After all solid dihydroxyaromatic compound has been consumed, the pH is raised to a higher value in the range of about 7-12, preferably 9-11, and maintained in said range until a major proportion of the unreacted phosgene has been hydrolyzed. At the same time, any monochloroformate in the product may be converted to bischloroformate.

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

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