A Highly Efficient and Selective Aerobic Cross‐Dehydrogenative‐Coupling Reaction Photocatalyzed by a Platinum(II) Terpyridyl Complex |
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| Authors: | Jian‐Ji Zhong Qing‐Yuan Meng Ge‐Xia Wang Dr Qiang Liu Dr Bin Chen Dr Ke Feng Prof Dr Chen‐Ho Tung Prof Dr Li‐Zhu Wu |
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| Institution: | 1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190 (P.R. China), Fax: (+86)?10‐8254‐3580;2. State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (P.R. China) |
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| Abstract: | Thanks to the superior redox potential of platinum(II) complex compared with that of Ru(bpy)32+ in the excited state, an efficient and selective visible‐light‐induced CDC reaction has been developed by using a catalytic amount (0.25 %) of 1 . With the aid of FeSO4 (2 equiv), the corresponding amide could not be detected under visible‐light irradiation (λ=450 nm), but the desired cross‐coupling product was exclusively obtained under ambient air conditions. A spectroscopic study and product analysis revealed that the CDC reaction is initiated by photoinduced electron‐transfer from N‐phenyltetrahydroisoquinoline to the complex. An EPR (electron paramagnetic resonance) experiment provides direct evidence on the generation of superoxide radical anion (O2? . ) rather than singlet oxygen (1O2) under irradiation of the reaction system, in contrast to that reported in the literature. Combined, the photoinduced electron‐transfer and subsequent formation of superoxide radical anion (O2? . ) results in a clean and facile transformation. |
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| Keywords: | aerobic reaction cross‐coupling platinum radicals visible‐light catalysis |
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