Process for selective hydrodefluorination
AssigneeOccidental Chemical Corporation
InventorsJeffrey S. Stults, Lawrence B. Fertel, William S. Derwin
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Abstract
A process for the selective hydrodefluorination of a tetrafluorophthalimide compound of the formula ##STR1## where X is 1 and R is a monovalent organo group; or X is 2 and R is a divalent organo group; comprises reacting (I) the tetrafluorophthalimide with zinc in an aqueous alkali metal hydroxide medium. The product may be hydrolyzed to form 3,4,6-trifluorophthalic acid.
Claims22
A process for the preparation of 3,4,6-trifluorophthalic acid of the formula ##STR5## which comprises (A) treating tetrafluorophthalimide of the formula ##STR6## where X is 1 or 2;
- and when X is 1, R is a monovalent organo group;
- and when X is 2, R is a divalent organo group, with zinc in the presence of aqueous alkali metal hydroxide to form a selectively defluorinated reaction product, and
- (B) hydrolyzing the reaction product.
A process for the selective hydrodefluorination of a tetrafluorophthalimide compound of the formula ##STR7## where X is 1 or 2;
- and when X is 1, R is a monovalent organo group;
- and when X is 2, R is a divalent organo group;
- which comprises reacting the compound (I) with zinc in an aqueous alkali metal hydroxide medium.
A process for the preparation of 3,4,6-trifluorophthalic acid of the formula ##STR8## which comprises (A) treating tetrafluorophthalimide of the formula ##STR9## where R is alkyl of 1-8 carbon atoms or aryl of 6-14 carbon atoms, with zinc in the presence of 5-20% aqueous sodium hydroxide at a temperature of about 20.degree. to 80.degree. Celsius , to form a selectively defluorinated reaction product, and
- (B) hydrolyzing the reaction product by treatment with a mineral acid.
Dependencies are inferred from the claim text.