| 摘要 |
: The invention relates to 2,2-difluoropropionic acid derivatives of the following 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'CH2CF2CF2O- (IV) wherein X' is fluorine, chlorine, bromine, iodine, or the group of the formula: R1O- or R2COO- as defined above; 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 for a perfluorohydrocarbon group, or an aromatic hydrocarbon group having 6 to 8 carbon atoms optionally bearing at least one substituent, or a grsup of the formula: -OCH2Rf (V') wherein Rf is an aliphatic perfluorohydrocarbon having 1 to 7 carbon atoms. These derivatives are useful as solvents, catalysts, monomers, etc., and can be formed by ring opening of tetrafluorooxetane in the presence of a co-reactant by which the group X is introduced into the derivative. |
