Process for preparing 1,1-dihalo-1,2,2,2-tetrafluoroethanes

Details Process for preparing 1,1-dihalo-1,2,2,2-tetrafluoroethanes Process for preparing 1,1-dihalo-1,2,2,2-tetrafluoroethanes

1986-12-19

1988-05-31

Evans, J. E.

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

Organic compounds

Halogen containing

570134, 570137, C07C 1720, C07C 1700, C07C 1908

Patent

active

047482842

ABSTRACT:
A process for preparing 1,1-dihalo-1,2,2,2-tetrafluoroethanes by isomerization of 1,2-dihalotetrafluoroethanes at their reflux temperature, by using, as a catalyst, the reaction product prepared "in situ" from an anhydrous aluminum halide with at least equimolecular amounts of the isomer, 1,1-dihalo-1,2,2,2-tetrafluoroethane in a medium consisting of 1,2-dihalotetrafluoroethane. The products find application as intermediates for pyrethroid insecticides.

REFERENCES:
patent: 2598411 (1952-05-01), Miller et al.
patent: 2971990 (1961-02-01), Larsen
patent: 3087974 (1963-04-01), Hauptschein et al.
patent: 3818229 (1974-06-01), Long
Okuhara, J. Org. Chem. (1978), 43(14), 2745-9 (Gov. Ind. Res. Inst. Nagoya, Japan).

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