The product formed by the disrotatory cyclization of the given diene M is to be drawn. The stereochemistry at new s p 3 hybridized carbon atoms is to be indicated. The given reaction whether occurs under photochemical or thermal conditions is to be predicted. Concept introduction: Electrocyclic reactions are pericyclic reactions which takes place by concerted mechanism. These reactions involve ring opening or ring closure in a conjugated polyene.

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Chapter 25, Problem 33P

Interpretation Introduction

Interpretation: The product formed by the disrotatory cyclization of the given diene M is to be drawn. The stereochemistry at new sp3 hybridized carbon atoms is to be indicated. The given reaction whether occurs under photochemical or thermal conditions is to be predicted.

Concept introduction: Electrocyclic reactions are pericyclic reactions which takes place by concerted mechanism. These reactions involve ring opening or ring closure in a conjugated polyene.

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