| http://www.w3.org/ns/prov#value | - The starting material was a copolymer made by the usual procedure and having the nominal composition: ##STR11## Ten g of the copolymer, 2.25 g of sorbic acid and 0.1 g of triphenylphosphine as catalyst in 100 ml of toluene was refluxed under nitrogen for 18 hrs then cooled to room temperature.
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