(a)
Interpretation:
The product of the given Diels-Alder reaction that is produced faster is to be determined.
Concept introduction:
If a reaction can proceed through two intermediates or transition states, the one resembles the reactant more closely forms faster. At low temperatures, where further rearrangement is not possible, the product formed from this intermediate/transition state is favored. This is known as kinetic control of the reaction, and the favored product is known as the kinetic product.
(b)
Interpretation:
The more stable product of the given Diels-Alder reaction is to be determined.
Concept introduction:
If a reaction can proceed through two intermediates or transition states, the one resembles the reactant more closely forms faster. At high temperatures, further rearrangement of the intermediate/transition state to a most stable one is possible. The product formed from this intermediate/transition state is the most stable product and is favored at high temperatures. This is known as
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