Abstract
A synthetic approach for the preparation of amorphous poly(aryl ether benzil)s has been developed wherein the generation of the aryl ether linkage is the polymer-forming reaction. Fluoride atoms located at thepara-position of the benzil moiety were found to be very activated toward nucleophilic aromatic substitution. Facile displacement occurred at these positions since the benzil moiety can accept the negative charge developed in the transition state through a Meisenheimer complex intermediate, analogous to a conventional activating group (i.e., benzophenone). Two synthetic approaches were surveyed to determine the most efficient manner to prepare high molecular weight polymer
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