Number of electrons: NEt3 0.4-4 + Type of reaction: electrocyclic ring opening or closing cycloaddition... indicate number of electrons in each system: [ + ] sigmatropic rearrangement... indicate number of electrons in each system: [] Allowed stereochemistry: suprafacial suprafacial + suprafacial antarafacial suprafacial + antarafacial conrotatory antarafacial + antarafacial disrotatory

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