Process for the synthesis of acid halides and reactants useful for its implementation
AssigneeRhone-Poulenc Chimie
InventorsGerard Forat, Laurent Gilbert
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Abstract
The subject of the present invention is a new catalytic system and a process for the synthesis of acid halides, especially from haloforms. This process for halogenating by means of a haloform is characterized by the use of a metal chloride, advantageously trivalent, as a catalyst, the solubility of which in the reaction mixture is at least equal to one millimole, preferably 1/100 mole per liter, and the metal chloride also being at least half, advantageously two-thirds and preferably three-quarters in the dissolved state.
Claims20
A process for forming a perfluoro acid halide of formula R--COX comprising the steps of mixing together
- a haloform,
- a metal chloride,
- and a substrate to form a reaction mixture wherein said haloform is of the formula Ar--CX.sub.3 wherein Ar is a residue having a doublet or an unsaturated bond in a position to stabilize a carbocation on the carbon atom of said haloform and wherein X is a halogen;
- wherein said metal chloride is trivalent and the solubility of said metal chloride in said reaction mixture is at least 1/100 mole per liter and wherein said metal chloride is at least 1/2 dissolved in said reaction mixture;
- and wherein said substrate is of the formula R--COOR' , wherein R is perfluorinated and is selected from the group consisting of perfluoroalkyl, perfluoroaryl, and perfluoroaralkyl radicals and R' is selected from the group consisting of hydrogen, alkyl and acyl radicals.
Dependencies are inferred from the claim text.