Nucleophilic cleavage of activated aryl ethers by a fluoride anion

Fluorinated poly(arylene ether ketone)s bearing pentafluorostyrene moieties prepared by a modified polycondensation

“…The most possible route appears to be an ether‐exchange reaction involving ether linkages in the polymer chain with the ortho ‐fluorines. This hypothesis is based on the information in which ether groups have been shown to have a potential to cleave and undergo ether interchange in the presence of fluorine ions 30, 31…”

“…This hypothesis is based on the information in which ether groups have been shown to have a potential to cleave and undergo ether interchange in the presence of fluorine ions. 30,31 The polymerization data in Table 1 indicate that the yields of the polymerization are less than 90% in all cases. These data are obtained after the polymers are washed with methanol.…”

Chain‐growth polycondensation of monomer consisting of two aromatic rings: Synthesis of well‐defined poly(ether sulfone) from 4‐fluoro‐4′‐hydroxydiphenyl sulfone

“…When the polymer with higher molecular weight was attempted to be prepared, conventional step‐growth polycondensation polymer was obtained as well as the chain‐growth polycondensation polymer. Some possible explanations for accompanying conventional polycondensation polymer at high feed ratios of [ 1a ] 0 /[ 2 ] 0 could be that the reaction of monomers with each other tends to take place at low concentration of initiator 2 , or poly(ether sulfone) backbone is liable to be cleaved by attack of the phenoxide of monomer44 and/or fluoride ion45–47 as the polymer chain becomes long, resulting in generation of a polymer bearing phenoxide and fluorine at both ends, followed by step‐growth polymerization.…”

Polyaromatics

“…The role of the fluoride anion in nucleophilic cleavage and transetherification in DPS solution at high temperature has been studied by Carlier et al 42 and Attwood et 1 2 1 . '~~ who made a detailed study of the kinetics of the arylethersulphone polycondensation reaction and the role of halide and phenate ions in the transetherification processes which occur.…”