2,2-difluoropropionic acid derivatives and a process for preparing the same.

摘要

2,2,3-trifluoropropionyl fluoride is prepared by opening the tetrafluorooxethane ring in the presence of a catalyst. Analogously, a novel 2,2-difluoropropionic acid derivative of the formula: XCH2CF2COY (I) wherein X is chlorine, bromine, iodine, a group of the formula: R1O- (II) or R2COO- (III) wherein R1 and R2 are each an aliphatic or halogenated aliphatic hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 8 carbon atoms optionally bearing at least one substituent, or a group of the formula: X min CH2CF2CF2O- (IV) wherein X min is fluorine, chlorine, bromine, iodine, the group of the formula: R1O- or R2COO-; and Y is fluorine, a group of the formula: -OR3 (V) wherein R3 is an aliphatic or halogenated aliphatic hydrocarbon group having 1 to 8 carbon atoms except a perfluorohydrocarbon group or an aromatic hydrocarbon group having 6 to 8 carbon atoms optionally bearing at least one substituent, or a group of the formula -OCH2Rf (V min ) wherein Rf is an aliphatic perfluorohydrocarbon having 1 to 7 carbon atoms is prepared.