Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethyl

Details Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethyl Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethyl

1987-07-23

1989-07-04

Brust, Joseph P.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562441, C07D30788, C07C10154

Patent

active

048452459

ABSTRACT:
Disclosed herein is a process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide, which process comprises oxidizing 2-[4,4'-bis-(dimethylamino)-benzhydryl]-5-dimethylaminobenzoic acid in an aqueous solution of a mineral acid of pH of from 2.0 to 4.0 with air, oxygen or a gas containing oxygen in the presence of at least one catalyst selected from the group consisting of compounds of iron, copper, cobalt, nickel, chromium, vanadium and manganese.

REFERENCES:
patent: 4076728 (1978-02-01), Maulding
patent: 4233223 (1980-11-01), Seibert

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