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Laser Raman detection of an electrogenerated intermediate during anodic synthesis of dihydrobenzofurans via formal [3+2] cycloaddition |
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| Institution: | 1. CPM, UMR 6226, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France;2. Institut des Matériaux Jean Rouxel (IMN), UMR 6502, Université de Nantes, 2 rue de la Houssinière, B.P. 32229, 44322 Nantes Cedex 3, France;3. Institut Universitaire de France (IUF), 103 bd Saint-Michel, 75005 Paris Cedex 05, France;4. Laboratoire MaSCE, UMR 6226, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France |
| Abstract: | A phenoxonium cation intermediate was successfully observed in situ by laser Raman spectroscopy during the electro-oxidation of 4-methoxyphenol in a lithium perchlorate/nitromethane electrolyte solution as shown by the Raman bands at 1665 cm−1 and 1615 cm−1. These conditions are those used for the electrosynthesis of dihydrobenzofurans by a formal 3+2] cycloaddition when the oxidation is carried out in the presence of an olefin. |
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