Dimethyl Sulfoxide → 2-Methylprop-2-enoic acid;styrene

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Then, into a 500 ml four necked flask, 30.0 g of the above polymer and 50 ml of methanol were added and dissolved, and then 4.2 of potassim hydroxide was added, stirred and dissolved. Then, 16.2 g of benzyl bromide and 100 ml of dimethyl sulfoxide were added thereto, and the mixture was stirred at 80° C. for 2 hours. The reaction solution was dropwise added to a methanol/1.5% hydrochloric acid aqueous solution (volume ratio of 1/1). A white powder was recovered and vacuum-dried to obtain a partial benzyl ester of a styrene/methacrylic acid copolymer (esterification rate: 50% to methacrylic acid, as determined by potentiometric titration). The obtained amount was 32.5 g.

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