Abstract
Electrocyclic reactions are characterized as thermal or photochemical reactions of open chain conjugated π- systems to form ring systems with a formation of a sigma bond across the ends of the conjugated π-system, or, the reverse of this reaction. These reactions are reversible in nature. The stereochemistry of the ring-closing and ring-opening of the reactions occurs through conrotatory (same sense in clockwise or anticlockwise) and disrotatory (opposite sense inward or outward) motions of the groups at the termini of the conjugated π- system or of the groups at the sp3 carbons of a ring system. Woodward and Hoffmann predicted the stereochemistry of these reactions for 4nπe and (4n+2) πe conjugated systems in thermal and photochemical conditions. These reactions are applicable in neutral acyclic, cyclic, and ionic conjugated π systems. The extensive applications of these reactions in the various types of conjugated π- systems are discussed in detail.
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Dinda, B. (2017). Electrocyclic Reactions. In: Essentials of Pericyclic and Photochemical Reactions. Lecture Notes in Chemistry, vol 93. Springer, Cham. https://doi.org/10.1007/978-3-319-45934-9_2
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DOI: https://doi.org/10.1007/978-3-319-45934-9_2
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