Process for preparing polyfluorochlorocarbonyl chlorides and per

Details Process for preparing polyfluorochlorocarbonyl chlorides and per Process for preparing polyfluorochlorocarbonyl chlorides and per

1994-12-20

1996-10-29

Killos, Paul J.

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

Organic compounds

Carboxylic halides

562851, 562852, 20415787, 20415794, 20415811, C07C 5158

Patent

active

055697828

ABSTRACT:
A process for preparing polyfluorochloro- and perfluorocarbonyl chlorides, for example for preparing perfluoropropionyl chloride, chlorodifluoroacetyl chloride or trifluoroacetyl chloride, in which starting materials are employed which have a CHCl.sub.2 group which is converted to a C(O)Cl group by photochemical oxidation with oxygen in the presence of added elemental chlorine and under exposure to activating irradiation by light having a wavelength .lambda..gtoreq.290 nm. The procedure is preferably unpressurized. Outstanding conversions with high selectivity are achieved using doped Hg light sources.

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Haszeldine et al., "Oxidation of Polyhalogeno-compounds . . . ", Journal 1959, pp. 387-396.
Francis et al., "Oxidation of Polyhalogeno-compounds . . . ", Journal (1955), pp. 2151-2163.
Wheaton et al., "Methyl Chlorodifluoroacetate as . . . ", J. Fluorine Chem., vol. 8, pp. 97-100 (1976).
Edney et al., "Chlorine Initiated Oxidation . . . ", J. Atmospheric Chem., vol. 12, pp. 105-120 (1991).

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