Dimethyl maleate can be synthesized from maleic anhydride and methanol, with sulfuric acid acting as acid catalyst, via a nucleophilic acyl substitution for the monomethyl ester, followed by a Fischer esterification reaction for the dimethyl ester. Dimethyl maleate belongs to the class of organic compounds known as fatty acid esters. These are carboxylic ester derivatives of a fatty acid. Dimethyl maleate is the methyl ester of maleic acid and the cis-isomer of dimethyl fumarate. Dimethyl maleate is a commonly used thiol-alkylating agent and enjoys widespread use in many organic synthesis. In the production of plastics, pigments, pharmaceuticals, and agricultural products, dimethyl maleate is used as an additive and an intermediate. In the production of paints, adhesives, and copolymers, dimethyl maleate is used as an intermediate. Dimethyl maleate is used in many organic syntheses as a dienophile for diene synthesis..Dimethyl maleate has also found use in applications where improvements in the hardness and toughness of polymer films are desired. This includes, in particular, the improvement of anti-blocking properties of copolymers of vinyl acetate with DMM. It is also used as an internal modifier to increase the glass transition temperature of styrene or vinyl chloride polymers.

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