P. Kubisa et T. Biedron, APPLICATION OF POLY(OXYETHYLENES) CONTAINING TERMINAL PHOSPHONIUM IONGROUPS AS PHASE-TRANSFER REACTION CATALYSTS, Reactive & functional polymers, 27(3), 1995, pp. 237-241
The activity of poly(oxyethylenes), terminated at both ends with phosp
honium ion groups, as catalysts in phase transfer reaction has been co
mpared with this of the nonionic analogs. The observed moderate enhanc
ement of activity for diionically terminated poly(oxyethylenes) may be
attributed to increasing alkali metal complexing ability, due to the
intramolecular aggregation of the ionic end-groups resulting in the fo
rmation of cyclic structure.