Autoxidation of alkyl-substituted aromatic ethers

Details Autoxidation of alkyl-substituted aromatic ethers Autoxidation of alkyl-substituted aromatic ethers

1984-10-29

1985-07-02

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549243, C07D30789

Patent

active

045269840

ABSTRACT:
A method is described for autoxidizing ortho-dialkyl substituted aromatic ethers directly to their corresponding carboxylic acid anhydrides. The method comprises autoxidizing the ethers in a first step in a solution of an aliphatic monocarboxylic acid having 2 to 8 carbon atoms to form a partially oxidized reaction mixture. The autoxidation of the partially oxidized mixture is continued in a second step after the addition of an anhydride of an aliphatic monocarboxylic acid having 3 to 8 carbon atoms and at a temperature of at least 130.degree. C. to form said anhydrides.
The anhydrides are used in the preparation of organic high temperature polymers such as polyamideimides, polyimides, polyetherimides, and polyetherimideamides.

REFERENCES:
patent: 2833816 (1958-05-01), Saffer et al.
patent: 3652598 (1972-03-01), Broadhead
Paparinska et al., Khim Tekhnol Khim 1974, 2, 86-97, (Chemical Abstracts, 82, 124995r, 1975).

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