Method for preparation of aromatic ether imides and for catalyst

Details Method for preparation of aromatic ether imides and for catalyst Method for preparation of aromatic ether imides and for catalyst

1983-04-25

1985-05-28

Berch, Mark L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548476, 548481, C07D20948

Patent

active

045202044

ABSTRACT:
The yield of aromatic ether imides prepared by reacting a substituted phthalimide (such as 4-nitro-N-methylphthalimide) with an alkali metal salt of a hydroxyaromatic compound (such as the disodium salt of bisphenol A) in the presence of a phase transfer catalyst is improved by conducting the reaction in o-dichlorobenzene as diluent. When the reaction mixture is subsequently extracted with water and/or aqueous alkali, o-dichlorobenzene can also be used in recovery of the phase transfer catalyst from the aqueous phase by extraction thereof. Such recovery is improved by dissolving a substantial amount of inorganic salt in the aqueous phase and by conducting the o-dichlorobenzene extraction at elevated temperatures.

REFERENCES:
patent: 4247464 (1981-01-01), Relles et al.
patent: 4257953 (1981-03-01), Williams et al.
patent: 4273712 (1981-06-01), Williams

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