Process for benzophenone tetracarboxylic acid

Details Process for benzophenone tetracarboxylic acid Process for benzophenone tetracarboxylic acid

1984-09-21

1986-07-08

Mars, Howard T.

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

Organic compounds

Carboxylic acids and salts thereof

549310, C07C 5109, C07D30788

Patent

active

045994455

ABSTRACT:
A method is described for autoxidizing particular ortho-dialkyl substituted aromatic compounds using a particular type of solvent which gives rise to the formation of 3-alkanoyloxyphthalide compounds, some of which are novel.
The phthalides in turn are ionically oxidized to their corresponding aromatic polycarboxylic acids.
Combination of the two methods provides a means for converting ortho dialkyl substituted aromatic compounds directly to the corresponding polycarboxylic acids in higher yields and at generally lower overall temperatures and reaction conditions compared to prior art methods.
Polycarboxylic acids so obtained are known to be useful in the preparation of alkyds, polyesters, and the like, and, particularly, in the formation of the corresponding acid anhydrides which are used in the preparation of organic high temperature polymers such as polyamides, polyamideimides, and polyimides.

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Fieser & Fieser, Organic Chemistry, 3rd ed., 1956, Reinhold Publ. Co., N.Y., pp. 656-663.

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