Process for preparing aromatic polycarboxylic acids

Details Process for preparing aromatic polycarboxylic acids Process for preparing aromatic polycarboxylic acids

1990-06-14

1992-02-11

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562480, 568331, C07C 51245, C07C 49213

Patent

active

050877429

ABSTRACT:
A process for preparing aromatic polycarboxylic acids is disclosed, wherein a benzil derivative is oxidized with molecular oxygen in the presence of an oxidation catalyst consisting substantially of at least one heavy metal catalyst selected from cobalt and manganese and a bromine catalyst in a solvent containing at least 50 wt.% of an aliphatic monocarboxylic acid having at most three carbon atoms.
According to this invention, there are provided 4,4'-bis(4-alkylphenyl)benzils (wherein alkyl is methyl, ethyl or isopropyl), which are novel benzil derivative.

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