Electron transfer reactions. A reinvestigation of the chlorination of 1-methyl-2-phenylindole with N-chlorobenzotriazole. The role of oxygen and oxygenated solvent
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- Vol. 23 (11) , 1779-1783
- https://doi.org/10.1039/p29910001779
Abstract
1-Methyl-2-phenylindole (1, MPI-H) reacts with N-chlorobenzotriazole (2, BT-Cl) to form the corresponding radical cation (MPI-H)˙+ which itself, or via the indolyl radical (MPI)˙+, formed by deprotonation of MPI-H˙+, reacts with oxygen or a nucleophilic solvent leading to indoxyls 4–7. Cyclic voltammetric studies, as well as the oxidation of MPI-H with BT-Cl carried out in the EPR cavity, show that the radical cation MPI-H˙+ dimerizes to give 3,3′-(MPI)28 which is transformed into the corresponding radical cation 3,3′-(MPI)2˙+ in the reaction medium. The identity of this radical cation has been confirmed by oxidizing 3,3′-(MPI)2 directly. The formation of the radical cations MPI-H˙+ and 3,3′-(MPI)2˙+ has been monitored by UV–VIS spectroscopy and their decay rate constants measured.Keywords
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