Molecular self-modification: homolog of a manganese laundry bleach catalyst oxidatively transforms its tetradentate ligand into a novel hexadentate derivative |
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Authors: | Guochuan Yin Suparna Baksi Roy Andrew M. Danby Victor Day John Carter William M. Scheper Daryle H. Busch |
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Affiliation: | 1. Department of Chemistry, The University of Kansas, Lawrence, KS, 66045, USA 2. The Procter and Gamble Company, Cincinnati, OH, 45202, USA
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Abstract: | On the basis of mass spectral studies alone, the relatively new manganese complex, Mn(Et2EBC)Cl2 (Et2EBC = 4,11-diethyl-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane), a homolog of the well proven, peroxide-based laundry bleach, Mn(Me2EBC)Cl2, has been reported to undergo a sequence of 2-electron oxidation steps, ultimately converting its ethyl groups into chelated ethoxo and methylene carboxylato groups, [MnIV{(?OCH2CH2)(?O2CCH2)}EBC)](PF6)2. We report here the isolation and characterization of that unusual product, and provide insight into the remarkable catalytic pathway to its formation. At temperatures above 0 °C, oxidation by aqueous H2O2 reliably transforms Mn(Et2EBC)Cl2 into [MnIV{(?OCH2CH2)(?O2CCH2)}EBC)]2+. The experimental data for this intramolecular ethyl group transformation is consistent with oxygen insertion into a methyl C?CH moiety of the ethyl group, ?CNCH2C(?CH)H2, by the MnIV?COOH functional group. |
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