Versatile Visible-Light-Driven Synthesis of Asymmetrical Phosphines and Phosphonium Salts |
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| Authors: | Dr. Percia Beatrice Arockiam Ulrich Lennert Christina Graf Robin Rothfelder Dr. Daniel J. Scott Tillmann G. Fischer Prof. Dr. Kirsten Zeitler Prof. Dr. Robert Wolf |
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| Affiliation: | 1. Institute of Inorganic Chemistry, University of Regensburg, 93040 Regensburg, Germany;2. Institute of Inorganic Chemistry, University of Regensburg, 93040 Regensburg, Germany Both authors contributed equally to this work.;3. Institute of Organic Chemistry, University of Leipzig, 04103 Leipzig, Germany |
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| Abstract: | Asymmetrically substituted tertiary phosphines and quaternary phosphonium salts are used extensively in applications throughout industry and academia. Despite their significance, classical methods to synthesize such compounds often demand either harsh reaction conditions, prefunctionalization of starting materials, highly sensitive organometallic reagents, or expensive transition-metal catalysts. Mild, practical methods thus remain elusive, despite being of great current interest. Herein, we describe a visible-light-driven method to form these products from secondary and primary phosphines. Using an inexpensive organic photocatalyst and blue-light irradiation, arylphosphines can be both alkylated and arylated using commercially available organohalides. In addition, the same organocatalyst can be used to transform white phosphorus (P4) directly into symmetrical aryl phosphines and phosphonium salts in a single reaction step, which has previously only been possible using precious metal catalysis. |
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| Keywords: | alkylation arylation phosphane phosphorus photocatalysis |
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