title: New and efficient syntheses of alpha-iodo-alpha,alpha-difluoro- and beta-iodo-alpha,alpha,beta,beta-tetrafluorocarboxylic acid derivatives as useful building blocks for making functional fluoro compounds.
abstract: Perfluoroolefins reacted with I-Cl and ClSO(3)H under mild conditions to give R(F)CFICF(2)OSO(2)Cl, which could be readily converted into various alpha-iodo-perfluorocarboxylic acid derivatives or telomerized with tetrafluoroethylene to I(CF(2)CF(2))(n)()OSO(2)Cl. Ring-opening reaction of perfluoroalkoxypentafluorocyclopropane with iodine at 240 degrees C produced ICF(2)CF(2)COF, which was quenched by alcohol, water, or NH(3) to give beta-iodo-alpha,alpha,beta,beta-tetrafluorocarboxylic acid derivatives. These functional fluorinated iodides can be used as building blocks for making selectively fluorinated compounds.
authors.affiliation: DuPont Dow Elastomers, L.L.C., and DuPont Central Research and Development, Experimental Station, Wilmington, Delaware 19880, USA.
authors.forename: Ming-H
authors.initials: MH
authors.lastname: Hung
authors.forename: Lu
authors.initials: L
authors.lastname: Long
authors.forename: Zhen-Yu
authors.initials: ZY
authors.lastname: Yang