Oxaloyl chloride

The reaction is fundamentally a Friedel-Crafts reaction utilizing thi-onyl chloride followed by the reduction of the sulfoxide to the sulfide with oxaloyl chloride. The sulfide group activates the fluorine atom for the nucleophilic aromatic substitution polymerization. Thus, the ether linkage in the backbone of the polymer can be readily produced by a nucleophilic aromatic substitution. The reaction with bisphenol A proceeds at 150 C. 

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