Preparation of halogen substituted phthalic anhydride

Details Preparation of halogen substituted phthalic anhydride Preparation of halogen substituted phthalic anhydride

1988-02-24

1990-12-18

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549240, 549247, C07D30789

Patent

active

049787608

ABSTRACT:
A process for the preparation of halogen substituted phthalic anhydrides of the formula: ##STR1## wherein x is a halogen, by the reaction of a halogen substituted tetrahydrophthalic phthalic anhydride of the formula ##STR2## or a geminal dihalogen substituted hexahydrophthalic anhydride of the formula ##STR3## in a vapor or liquid phase while mixed with an air flow and an activated carbon catalyst at an elevated temperature.

REFERENCES:
patent: 4560772 (1985-12-01), Telschow et al.
patent: 4560773 (1985-12-01), Telschow
patent: 4709056 (1987-11-01), Cotter et al.
Ohkatsu et al, J. Japan Petrol. Inst., vol. 22 (1979), pp. 164-169.
Bergmann, J.A.C.S., vol. 64 (1942) pp. 176-177.
Russian Chemical Reviews, Nov. 1963, pp. 571-589.
Hampel et al, Glossary of Chemical Terms, 2nd Ed., Van Nostrand (1982) pp. 5 & 6.

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