The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 1991
Filed:
Oct. 26, 1990
Klaus Raab, Burgkirchen, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
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.