Process for the preparation of 4-fluorophthalic anhydride

Details Process for the preparation of 4-fluorophthalic anhydride Process for the preparation of 4-fluorophthalic anhydride

1984-05-02

1985-05-14

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30789

Patent

active

045173729

ABSTRACT:
This invention relates to a process for the preparation of 4-fluorophthalic anhydride which comprises contacting a dihalohexahydrophthalic anhydride of the formula ##STR1## where X is Cl or F, with a dehydrogenation catalyst. Advantageously, the process of the invention may be carried out in the presence of a hydrogen acceptor. The preferred hydrogen acceptor is a halocarbon hydrogen acceptor of the formula ##STR2## where Y is Cl, Br, or I; Z is Cl, Br or I; m is 0 to 4, n is 0 to 3, p is 0 to 3, and m+n is at least 1; with the proviso that when m is 0, p is at least 1.

REFERENCES:
patent: 3480667 (1969-11-01), Siegart et al.
patent: 3956321 (1976-05-01), Markezich
Bergmann, J.A.C.S., vol. 64 (1942) pp. 176 & 177.

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