Predict the initial and isolated products for the reaction. *Hint:* the products are isomers and in equilibrium with each other. Predict the initial product. | Select | Draw | Rings | More | Erase | | --- | --- | --- | --- | --- | | / | / | / | C | H | | Draw the isolated product. | | | --- | --- | | Select | |

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Answer

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Step 1
: Identify the reactants and the type of reaction

The given problem involves a chemical reaction where the reactants are buta- 1,3 -diene and maleic anhydride. The reaction is a Diels-Alder reaction, which is a type of [pericyclic reaction](https://en.wikipedia.org/wiki/Pericyclic_reaction) that results in the formation of cyclohexene derivatives. The reaction is: buta- 1,3 -diene + maleic anhydride → initial product(2$)

Step 2
: Understand the reaction mechanism

The Diels-Alder reaction is a [4π + 2π](https://en.wikipedia.org/wiki/Diels%E^2%80%93Alder_reaction#Reaction_mechanism) electrocyclic reaction, where buta- 1,3 -diene acts as the diene and maleic anhydride acts as the dienophile. The reaction proceeds through a concerted mechanism, forming two new sigma bonds and one six-membered ring.

Final Answer

The initial products for the Diels-Alder reaction between buta- 1,3 -diene and maleic anhydride are the _endo_ and _exo_ isomers. The isolated product is typically the more stable _endo_ isomer, represented as: ``` H | H—C=C—C=C—C—O | | | H H O | | | C C C | | | O—C=C=O H ```

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