A NEW METHOD FOR THE PREPARATION OF PERFLUOROCARBOXYLIC ACIDS
The reaction of both primary perfluoroalkyl iodides and bromides containing 3-12 carbon atoms with a rongalite-NaHCO3 reagent in aqueous dipolar aprotic solvents, such as DMF or DMSO, has been investigated.The reaction gave sodium perfluorocarboxylates in 51-86percent yields, and these were transformed to the respective perfluorocarboxylic acids by treatment with sulfuric acid.This provides a new method for the synthesis of perfluorocarboxylic acids.
Reactions of benzamidoxime and its sodium salt with methyl esters of fluorinated acids
The reactions of benzamidoxime and its sodium salt with methyl esters of fluorinated esters at 20-100 deg C give 1,2,4-oxadiazoles or O-addition products.