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Woodward-Hoffman rules

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Heterocyclic and Pericyclic Chemistry Flashcards on Woodward-Hoffman rules, created by al44 on 03/12/2013.
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Flashcards by al44, updated more than 1 year ago
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Created by al44 almost 11 years ago
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Question Answer
Woodward-Hoffman rules for all pericyclic reactions 1.Thermally Allowed when total number of (4q+2)s and (4ra) components is odd 2. Photochemically allowed when even
Cycloadditions and group transfer reactions (4n + 2) electrons then both components are suprafacial (4n) electrons than one component is suprafacial the other is antarafacial
Electrocyclic reactions (4n+2) electrons then disrotatory (4n) electrons then conrotatory
[1,n] sigmatropic rearrangements If (4n+2)- s,r -departs and reattaches on same face If (4n)-s,i or a,r Reverse for photo- departs and reattaches on different face
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