Independent generation of triplet 1,4-biradical intermediates implicated in the photochemical cycloaddition reaction between 2-cyclopentenone and acrylonitrile
作者:Paul Krug、Andreas Rudolph、Alan C. Weedon
DOI:10.1016/s0040-4039(00)79292-6
日期:1993.11
product and their reversion to ground state starting materials. This provides further evidence against the long-held view that the relative rates of formation of the biradicals mediated by an oriented triplet exciplex governs the reaction regiochemistry. It is also found that the regiochemistry of the photochemical cycloaddition reaction between cyclopentenone and acrylonitrile is reversed from that obtained
3-氰基双环[3.3.0]辛烷-2,6-二酮和3-氰基双环[3.3.0]辛烷-2,8-二酮的Norrish I型光化学用于产生与光化学有关的三重态1,4-双自由基2-环戊烯酮与丙烯腈的环加成反应。这些双基自由基的命运已经确定,它们表明光环加成反应区域化学是由双基自由基向产物的封闭与它们向基态起始原料的转化之间的竞争所支配的。这提供了进一步的证据,反对长期以来的观点,即定向三重态激基复合物介导的双自由基的相对形成速率决定了反应的区域化学。