Dibenzyl → 4-(2-Phenylethyl)benzene-1-sulfonic acid

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Polybibenzyl sulfone homopolymers are prepared by heating bibenzyl- 4 -sulfonyl chloride in the presence of a catalytic amount of an anhydrous Lewis acid, or by using a stoichiometric mixture of bibenzyl and bibenzyl- 4,4' -disulfonyl chloride as hereinafter described. The preparation of the homopolymer first necessitates the synthesis of either the mono or di sulfonyl chloride derivative of bibenzyl. Bibenzyl- 4 -sulfonyl chloride may be prepared by a three step procedure by treating bibenzyl in solution with approximately equi molar quantities of chlorosulfonic acid to form bibenzyl- 4 -sulfonic acid followed by neutralization in an aqueous medium using sodium or barium hydroxide to yield the sodium or barium salt which is in turn treated in a solvent with an acid halide such as thionyl chloride to yield bibenzyl- 4 -sulfonyl chloride. Another suitable technique for the preparation of the monosulfonyl chloride derivative involves the treatment of the free sulfonic acid derivative of bibenzyl in a solvent with a complex of phosgene and a tertiary organic amide.

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