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Synthesis of cyclic carboxylic acid anhydrides

I am having trouble understanding why when maelic acid is heated to about 100 C it forms maelic anhydride but fumaric acid requires a much higher temp 250-300 before it dehydrates. Then in addition it only forms maleic anhydride?

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The physical properties of maleic acid are very different from that of fumaric acid. Maleic acid is soluble in water whereas

fumaric acid is not and the melting point of maleic acid (130 - 139 °C) is also much ...

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