Triplet Acetylenes as Synthetic Equivalents of 1,2-Bicarbenes: Phantom n,π* State Controls Reactivity in Triplet Photocycloaddition
作者:Tarek A. Zeidan、Serguei V. Kovalenko、Mariappan Manoharan、Ronald J. Clark、Ion Ghiviriga、Igor V. Alabugin
DOI:10.1021/ja043803l
日期:2005.3.1
reactivetriplet excited states (intersystem crossing: ISC) and/or to the radical-anion (photoelectron transfer from the diene to the excited acetylene: PET). Dramatically enhanced ISC between pi-pi S(1) state and "phantom" n,pi triplet excited state is likely to be important in directing reactivity to the triplet pathway. The role of PET can be minimized by the judicious choice of reaction conditions