(Perfluoroacyl)thiophens. Part II. Fluorination of hexafluoro-1,3-di-(2-thenoyl)propane

Abstract

Improved yields of hexafluoro-1,3-di-(2-theonyl)propane are obtained by the reaction of perfluoroglutaric acid with a large excess of 2-thienylmagnesium bromide. The diketone has been successfully fluorinated with sulphur tetrafluoride to give decafluoro-1,5-di-(2-thienyl)pentane and a small quantity of material believed to be octafluoro-2,6-di-(2-thienyl)pyran. Mild nitratio of the former gives a mixture of isomeric dinitro-derivatives.