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Phthalic anhydride reacts with ethylene glycol to form polyester. Draw the mechanisms associated with the di-esterification of a single phthalic anhydride monomer to depict how

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Phthalic anhydride reacts with ethylene glycol to form polyester. Draw the mechanisms associated with the di-esterification of a single phthalic anhydride monomer to depict how only one water molecule is condensed during the formation of two ester moieties. You may use a proton catalyst for one of the mechanisms if you prefer. (5pts)

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