Synthesis of 3,6-dioxa-Δ7-4-trifluoromethyl perfluorooctyl trifluoromethyl sulfonimide: bis[(perfluoroalkyl)sulfonyl] superacid monomer and polymer

Self-emulsifying polymerization (SEP) of 3,6-dioxa-Δ7-4-trifluoromethyl perfluorooctyl trifluoromethyl sulfonimide with tetrafluoroethylene

“…The monomer CF 2 CFOCF 2 CF(CF 3 )OCF 2 CF 2 SO 2 NNaSO 2 CF 3 was prepared as previously described [4]. The solutions used in the NMR study were made by placing 2.2209 g C 7 F 15 CO 2 NH 4 or 3.0634 g of sulfonimide monomer into a 25 ml volumetric flask.…”

“…The original polymers, known as perfluorosulfonimide ionomers or PFSI, were produced by the copolymerization of a perfluorovinylethersulfonimide monomer, e.g. CF 2 CFOCF 2 CF(CF 3 )OCF 2 CF 2 SO 2 N(Na)SO 2 CF 3 , with tetrafluoroethylene in an aqueous emulsion polymerization system using C 7 F 15 CO 2 NH 4 as the emulsifying agent [4]. In the course of performing this work, it was noticed that the perfluorosulfonimide monomers had surfactant-like properties and questions arose about their emulsifying role in the polymerization process.…”

Alkylation of Hydroquinone with tert-Butanol Catalyzed by Polymer-supported Sulfonimide

“…On the other hand, as the high acid strength [18], the polymers containing sulfonimide groups have recently received considerable attention in the development of new polymer-supported Brønsted acids [19][20][21].…”

Synthesis of Polyphosphazene with Pendent Perfluorobutylsulfonylimide Group

“…9,11,12 Because of the high acid strength of sulfonimide acids, 13 the materials containing sulfonimide groups have become attractive alternatives to sulfonic acid containing materials. [14][15][16] Hofmann and co-workers 17 have reported the synthesis of polyphosphazenes with trifluoromethylsulfonylimide side group by using NaOC 6 H 4 NNaSO 2 CF 3 . Quite recently, we prepared polystyrenes with pendent perfluoroalkylsulfonylimide groups and found that the polymer with perfluorobutylsulfonylimide group had higher acid strength than that with trifluoromethylsulfonylimide, 13,18 and also the polystyrenes with pendent perfluoroalkylsulfonylimide groups were very good reusable catalysts for direct condensation of carboxylic acids and alcohols.…”