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Problems and exercisesStereochemistry

1. Stereochemistry and regiochemistry

Predict the result of the following processes:

Nine Diels-Alder reactions with numbered atoms: linear and cyclic dienes, with and without methyl or methoxy groups, with methyl vinyl ketone, ethene and acetylenedicarboxylate

2. The "meta" adduct

Using resonance forms, suggest an explanation for the fact that the "meta" regioisomer is always disfavoured.

A diene with an OR group at position 2 and another with an OR at position 1 react with an enone to give the

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