Nucleophlic displacement

A variation on the aromatic nucleophlic displacement chemistry described above employs the cuprous chloride catalyzed polycondensation of an aromatic dihydroxy compound with a divalent aromatic dibromo diaryl compound. This method has the advantage that the dibromo diaryl compound does not have to be activated by the sulfone group. This route can therefore be employed for copolymers and ter-polymers that incorporate the sulfone moiety along with other non-sulfone-containing repeat units. This synthesis route is commonly known as the Ullmann sjmthesis [4]. 

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