XII. Reaction of 2-methoxy -butadiene and carbonyl-acetylene.
| PARA ADDUCT | META ADDUCT | ||||||
|---|---|---|---|---|---|---|---|
| HOMO(diene)-LUMO(dienophile) | HOMO(diene)-LUMO(dienophile) | ||||||
 |
 LUMO(diene)-HOMO(dienophile) | LUMO(diene)-HOMO(dienophile) | 
|  | |||
XII. Reaction of 2-methoxy -butadiene and carbonyl-acetylene.
| PARA ADDUCT | META ADDUCT | ||||||
|---|---|---|---|---|---|---|---|
| HOMO(diene)-LUMO(dienophile) | HOMO(diene)-LUMO(dienophile) | ||||||
|
| LUMO(diene)-HOMO(dienophile) | LUMO(diene)-HOMO(dienophile) |
| | |||
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