title: Facile Synthesis and Polymerization of 2,6-Difluoro-2'-sulfobenzophenone for Aromatic Proton Conducting Ionomers with Pendant Sulfobenzoyl Groups.
abstract: The lithium salt of 2,6-difluoro-2'-sulfobenzophenone was conveniently synthesized in one-pot by reacting 2,6-difluorophenyllithium with 2-sulfobenzoic acid cyclic anhydride in THF at -70 °C whereafter the product crystallized out of solution. A poly(arylene ether) and a poly(arylene sulfide) were prepared by polycondensation reactions to demonstrate the reactivity and efficacy of this new monomer to produce sulfonated high-molecular weight aromatic polymers for fuel cell proton-exchange membranes. This work demonstrated that organolithium chemistry may offer versatile and straightforward pathways to new functional monomers with fluorine atoms activated for nucleophilic aromatic substitution reactions.
authors.affiliation: Polymer and Materials Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
authors.forename: Elin Persson
authors.initials: EP
authors.lastname: Jutemar
authors.forename: Shogo
authors.initials: S
authors.lastname: Takamuku
authors.forename: Patric
authors.initials: P
authors.lastname: Jannasch