Using curved arrows to symbolize the flow of electrons, write a stepwise mechanism for the isomerization of dimethyl maleate to dimethyl fumarate. Be certain to account specifically for the roles, if any, that light and bromine play in promoting this process.

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Using curved arrows to symbolize the flow of electrons, writethe stepwise mechanism for the bromination of anisole to providethe major monobromination product. Write the resonance structuresfor any charged, delocalized intermediates that are involved.

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Using curved arrows to symbolize the flow of electrons, propose a mechanism for the reaction of (E)-cinnamic acid and bromine that accounts for the stereochemistry fo the product obtained.

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a. Using curved arrows to symbolize the flow of electrons andsuitable stereochemical drawings, show the mechanism of thisreaction.

b. How does the mechanism you proposed in Parta support the formation of the racemic form of a singlediastereomer?