Phase-transfer catalysts can be used to transfer almost any anion into almost any organic liquid. When high temperatures are required for a reaction, a thermally stable phase-transfer catalyst can be used to transfer catalytic quantities of an anionic catalyst.
Tetraphenylphosphonium phenolate was used at a level of 0.02 wt% in the preparation of polyphosphonates from bisphenol A, methylphosphonic acid diphenyl ester and a crosslinker at 250-300 deg C.
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