Mechanistic study on the intramolecular oxa-[4 + 2] cycloaddition of substituted o-divinylbenzenes
1College of Chemical Engineering, Lanzhou University of Arts and Science, Lanzhou, 730010, China. zhxh135@163.com.
Abstract:
This paper reports a detailed computational study of the mechanisms of formation of oxacyclic derivatives from substituted o-divinylbenzenes by a photoinduced intramolecular oxa-[4 + 2] cycloaddition. The reaction mechanism and chemoselectivity of trans, trans- and cis, trans-substituted ortho-divinylbenzene were studied. Detailed density functional theory calculations show that the reaction system proceeds through two main steps: light-active intramolecular cyclization and Diels-Alder reactions of C=O. Trans, trans-products of cycloaddition of substituted o-divinylbenzenes are more favored than cis, trans-products. Compared with different substituents, the cycloaddition reaction of phenyl ketone has a relatively low activation barrier, and the strong electron-withdrawing group on the benzene ring is more favorable for the intramolecular cycloaddition reaction of substituted o-divinylbenzenes.
Related Concept Videos
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
Intermolecular vs Intramolecular Forces
Criteria for Aromaticity and the Hückel 4n + 2 Rule
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...
Intramolecular Aldol Reaction
Cycloaddition Reactions: Overview
Radical Reactivity: Intramolecular vs Intermolecular


![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)