IX. Reaction of 1-methyl-butadiene and acrylic acid.
| ORTO ADDUCT | META ADDUCT | ||||||
|---|---|---|---|---|---|---|---|
| HOMO(diene)-LUMO(dienophile) | HOMO(diene)-LUMO(dienophile) | ||||||
 |  LUMO(diene)-HOMO(dienophile) | LUMO(diene)-HOMO(dienophile) |   | ||||
IX. Reaction of 1-methyl-butadiene and acrylic acid.
| ORTO ADDUCT | META ADDUCT | ||||||
|---|---|---|---|---|---|---|---|
| HOMO(diene)-LUMO(dienophile) | HOMO(diene)-LUMO(dienophile) | ||||||
| | LUMO(diene)-HOMO(dienophile) | LUMO(diene)-HOMO(dienophile) | | ||||
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