Cyclic monocarbonate bishaloformates

Details Cyclic monocarbonate bishaloformates Cyclic monocarbonate bishaloformates

1989-05-24

1990-05-01

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549 10, C07D32112, C07D32710

Patent

active

049219758

ABSTRACT:
Cyclic monocarbonate bischloroformates are prepared by the reaction of a carbonyl halide such as phosgene with a bridged substituted resorcinol or hydroquinone such as bis(2,4-dihydroxy-3-methylphenyl)methane or bis(2,5-dihydroxy-3,4,6-trimethylphenyl)methane in the presence of aqueous alkali metal hydroxide. The cyclic monocarbonate bischloroformates may be used for the preparation of linear or cyclic polycarbonates containing cyclic carbonate structural units, which may in turn be converted to crosslinked polycarbonates.

REFERENCES:
patent: 3155683 (1964-11-01), Moody
patent: 4129574 (1978-12-01), Hallgren
patent: 4696997 (1987-09-01), Rosenquist
patent: 4701538 (1987-10-01), Rosenquist et al.

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