Engineering
Chemistry
Chemical reactions of phenol
Question
Consider the reaction
here X is
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Solution
This is a Diels-Alder reaction between a diene (cyclopentadiene) and a dienophile (maleic anhydride). The reaction proceeds via a concerted cycloaddition mechanism, forming a new six-membered ring. The product X is the endo adduct due to secondary orbital interactions favoring this stereochemistry.
The correct structure of X is: