Changing the regiopurity of mixtures containing 4,4'-disubstitut

Details Changing the regiopurity of mixtures containing 4,4'-disubstitut Changing the regiopurity of mixtures containing 4,4'-disubstitut

1989-11-16

1993-06-22

Dees, Jose G.

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

Organic compounds

Carbonate esters

558274, C07C 6996

Patent

active

052217981

ABSTRACT:
The 4,2'-disubstituted diphenyl carbonate or, optionally, ether content of regioimpure mixtures of compounds of formula: ##STR1## where X is F, Cl, and NO.sub.2, can be decreased to essentially zero starting with o-, m- and p-containing regioimpure mixtures by treating with the corresponding m- or p-substituted phenol and, optionally, a decarboxylation catalyst and removing the o-substituted phenol produced by volatilization or recrystallization from a solvent.

REFERENCES:
patent: 3642866 (1972-02-01), Witt et al.
patent: 3736350 (1973-05-01), Mickel et al.
patent: 4101569 (1978-07-01), Mazanek et al.
patent: 4182726 (1980-01-01), Illuminate et al.

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