Organophotocatalysis: Insights into the Mechanistic Aspects of Thiourea‐Mediated Intermolecular [2+2] Photocycloadditions |
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| Authors: | Nandini Vallavoju Dr. Sermadurai Selvakumar Dr. Barry C. Pemberton Dr. Steffen Jockusch Prof. Dr. Mukund P. Sibi Prof. Dr. Jayaraman Sivaguru |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND, USA;2. Department of Chemistry, Columbia University, New York, NY, USA;3. http://sivaweb.chem.ndsu.nodak.edu |
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| Abstract: | Mechanistic investigations of the intermolecular [2+2] photocycloaddition of coumarin with tetramethylethylene mediated by thiourea catalysts reveal that the reaction is enabled by a combination of minimized aggregation, enhanced intersystem crossing, and altered excited‐state lifetime(s). These results clarify how the excited‐state reactivity can be manipulated through catalyst–substrate interactions and reveal a third mechanistic pathway for thiourea‐mediated organo‐photocatalysis. |
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| Keywords: | asymmetric catalysis organocatalysis photochemistry photocycloadditions thioureas |
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