US Patent 7385067 Process for the preparation of compounds having a CF

The invention relates to a process for the preparation of compounds containing at least one —CF2—O— bridge in the molecule, in whicha) an acid is added onto at least one ketene dithioketal,b) the resultant bis(alkylthio)carbenium salt is reacted with at least one compound having at least one hydroxyl group in the presence of a base,c) and subsequently, preferably in situ, the resultant dithioorthoester is subjected to oxidative fluorodesulfurisation using a fluorinating agent and an oxidant to give the compound containing at least one —CF2—O— bridge in the molecule.