Process for the preparation of extensively fluorinated alkyl bro

Details Process for the preparation of extensively fluorinated alkyl bro Process for the preparation of extensively fluorinated alkyl bro

1990-10-26

1991-12-17

Siegel, Alan

Textiles: braiding, netting, and lace making

C07C 1720

Patent

active

050736515

ABSTRACT:
A process for the preparation of extensively fluorinated alkyl bromides from the corresponding iodides is described in which, in a dipolar aprotic solvent, a bromide which is present as a salt of an alkali metal, alkaline earth metal, copper or substituted or unsubstituted amonium is reacted with an extensively fluorinated alkyl iodide at 120.degree. to 200.degree. C. The reaction can be carried out at -10.degree. to +120.degree. C., in some cases with improved yields if it is carried out in the presence of an alkali metal salt of at least one hydroxyalkanesulfinic acid having 1 to 5 carbon atoms. The novel process enables uncomplicated apparatuses to be used without particular safety measures and presents no corrosion problems.

REFERENCES:
patent: 2678953 (1954-05-01), Conly
patent: 2875253 (1959-02-01), Barnhart
Haszeldine, R. N., J. Chem. Soc.: 3761-3768 (1953).
Long, D. M. et al., Preparation Properties and Industrial Applications of Organofluorine Compounds, New York, John Wily and Sons, 1982, p. 154.
Huang, B. et al., Chem. Abs. 102:78312x (1985).
Furutaka, Y. et al., Chem. Abs. 104:88106p (1986).

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