Patent ID: 7541488

Claim:
A process for the preparation of mono(fluoroalkyl)- or bis(fluoroalkyl)phosphoric acid, mono(fluoroalkyl) or bis(fluoroalkyl) phosphates, or the corresponding phosphoranes thereof, comprising: reacting a compound which is a bis(fluoroalkyl)phosphinic acid or a salt or ester thereof, or a (fluoroalkyl)phosphonic acid or a salt or ester thereof, with anhydrous hydrogen fluoride, wherein said mono(fluoroalkyl) and bis(fluoroalkyl) phosphates are compounds in which the phosphorus carries five or four fluorine atoms in addition to the one or two fluoroalkyl groups, said corresponding phosphoranes contain four or three fluorine atoms bonded directly to the phosphorus atom, and the fluoroalkyl groups are straight-chain or branched alkyl or cycloalkyl groups which are fluorinated and which contain no double bonds, or one, two or three double bonds, and said cycloalkyl groups are saturated, or partially or fully unsaturated, which are optionally substituted by C 1 - to C 6 -alkyl groups.