When equal molar amounts of phthalic anhydride and 1,2,3-propanetriol are heated, they form an amorphous polyester. Under these conditions, polymerization is regio- selective for the primary hydroxyl groups of the triol. OH heat + HO. LOH a polyester Phthalic anhydride 1,2,3-Propanetriol (Glycerol)

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A:

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