EntityQ899608· pop 20· linked from 299 articlesWoodward–Hoffmann rulesSign in to saveset of rules used to rationalize or predict certain aspects of the stereochemistry and activation energy of pericyclic reactionsConnectionsaromaticityEntityHOMO/LUMOEntityconrotatory and disrotatoryEntityAntarafacial and suprafacialEntityultraviolet radiationEntityatomic orbitalEntityactivation energyEntityexcited stateEntitysigma bondEntityDiels–Alder reactionEntitypericyclic reactionEntityBirch reductionEntityJulia olefinationEntityMeyer–Schuster rearrangementEntityHomologation reactionEntityelectronic effectEntityInternational Standard Book NumberEntityorganic chemistryEntityozoneEntitydigital object identifierEntityCategoriesCycloadditionsEponymous chemical rulesPhysical organic chemistry