%0 Journal Article %A Grilj, Jakob %A Todorova, Tanya Kumanova %A Yi, Chenyi %A Liu, Shi-Xia %A Vauthey, Eric %A Decurtins, Silvio %T A Spectroscopic and Computational Study of a Photoinduced Cross-Dehydrogenative Coupling Reaction of a Stable Semiquinone Radical %J Chemistry - A European Journal %@ 0947-6539 %V 18 %N 43 %P 13605-13608 %D 2012 %K density functional calculations %K photochemistry %K radicals %K transient absorption %K transition states %U http://doi.wiley.com/10.1002/chem.201201463 %R 10.1002/chem.201201463 %U http://archive-ouverte.unige.ch/unige:23743 %X Norrish-type-II reaction on a semiquinone radical: Stable semiquinone radicals serve as novel molecular platforms on which a Norrish-type-II photoreaction can be initiated. A detailed reaction scheme involving a 1,5-hydrogen transfer followed by a cyclization step that finally leads to a new C—C bond formation could be verified. Transient absorption spectroscopy and DFT calculations trace convincingly the intermediates and transition states along the reaction path (see scheme).