Autoxidation of bis(ortho dialkyl-phenoxy)benzophenones

Details Autoxidation of bis(ortho dialkyl-phenoxy)benzophenones Autoxidation of bis(ortho dialkyl-phenoxy)benzophenones

1985-02-14

1986-03-18

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

568333, C07D30789

Patent

active

045770344

ABSTRACT:
A method is described for autoxidizing a novel class of bis(ortho dialkyl-phenoxy)benzophenones directly to their corresponding dianhydrides. The method comprises autoxidizing the benzophenones in a solution of an aliphatic monocarboxylic acid having 3 to 8 carbon atoms with oxygen in the presence of a heavy metal oxidation catalyst and a promoter at a temperature of at least about 120.degree. C. to form the dianhydride.
The dianhydrides are used in the preparation of organic high temperature polymers such as polyetherimides.

REFERENCES:
patent: 2833816 (1958-05-01), Saffer et al.
patent: 3652598 (1972-03-01), Broadhead
patent: 3833546 (1974-09-01), Takekoshi et al.
patent: 4526984 (1985-07-01), Durvasula
Paparinska et al., Khim Tekhnol Khim 1974, 2, 86-97 (Chemical Abstracts, 82, 124995r, 1975).

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