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Maleic acid can be synthesized from fumaric acid through an isomerization reaction. This process involves converting the trans isomer (fumaric acid) to the cis isomer (maleic acid). The reaction can be catalyzed by heat or by using a strong acid, such as sulfuric acid. The reaction proceeds via an intermediate where the double bond rotates, allowing the two carboxyl groups to switch from a trans to a cis configuration.