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Photochemical cycloadditions of ethene and propene to benzene

✍ Scribed by Marlis F. Mirbach; Manfred J. Mirbach; Alfons Saus

Publisher
Elsevier Science
Year
1977
Tongue
French
Weight
199 KB
Volume
18
Category
Article
ISSN
0040-4039

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✦ Synopsis

Addition of photoexcited benzene to olefinsgiveseither L.2-, 1.3-, or 1.4-adducts, depending on the nature of the olefin. The 1.3-addition of benzene to alkenes may proceed from the S l1 -state of benzene through a prefulvene intermediate or by a concerted meta addition. In some cases an exciplex intermediate has been proposed based on kinetic investigation. 2 The l.2-addition is believed to be the preferred product forming process when the adding olefins have certain donor or acceptor character. D. Bryce-Smith concluded from

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