Jh. Clark et al., COOPERATION BETWEEN CATALYTIC SITES ON A BICIPITAL SUPPORTED PHOSPHONIUM PHASE-TRANSFER CATALYST, Chemical communications, (21), 1996, pp. 2429-2430
A novel bicipital tetraarylphosphonium salt grafted to silica gel is p
repared and characterised, and gives unusually high catalytic rate enh
ancements in some nucleophilic substitution reactions, which suggest c
ooperation between the neighbouring phosphonium centres.