Photosensitized oxidation of sulfides: Discriminating between the singlet-oxygen mechanism and electron transfer involving superoxide anion or molecular oxygen
The oxidation of diethyl and diphenyl sulfide photosensitized by dicyanoanthracene (DCA), N-methylquinolinium tetrafluoroborate (NMQ +), and triphenylpyrylium tetrafluoroborate (TPP+) has been explored by steady-state and laser flash photolysis studies in acetonitrile, methanol, and 1,2-dichloroetha...
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| LEADER | 16362caa a22019937a 4500 | ||
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| 001 | PAPER-21808 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518205318.0 | ||
| 008 | 190411s2006 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-33745456218 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a CEUJE | ||
| 100 | 1 | |a Bonesi, S.M. | |
| 245 | 1 | 0 | |a Photosensitized oxidation of sulfides: Discriminating between the singlet-oxygen mechanism and electron transfer involving superoxide anion or molecular oxygen |
| 260 | |c 2006 | ||
| 270 | 1 | 0 | |m Albini, A.; Dept. Org. Chem., University of Pavia, v. Taramelli 10, 27100 Pavia, Italy; email: angelo.albini@unipv.it |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a The oxidation of diethyl and diphenyl sulfide photosensitized by dicyanoanthracene (DCA), N-methylquinolinium tetrafluoroborate (NMQ +), and triphenylpyrylium tetrafluoroborate (TPP+) has been explored by steady-state and laser flash photolysis studies in acetonitrile, methanol, and 1,2-dichloroethane. In the Et2S/DCA system sulfide-enhanced intersystem crossing leads to generation of 1O2, which eventually gives the sulfoxide via a persulfoxide ; this mechanism plays no role with Ph2S, though enhanced formation of 3DCA has been demonstrated. In all other cases an electron-transfer (ET) mechanism is involved. Electron-transfer sulfoxidation occurs with efficiency essentially independent of the sulfide structure, is subject to quenching by benzoquinone, and does not lead to Ph2SO cooxidation. Formation of the radical cations R2S.+ has been assessed by flash photolysis (medium-dependent yield, dichloroethane ≫ CH3CN > CH3OH) and confirmed by quenching with 1,4-dimethoxybenzene. Electron-transfer oxidations occur both when the superoxide anion is generated by the reduced sensitizer (DCA.-, NMQ.) and when this is not the case (TPP.). Although it is possible that different mechanisms op erate with different ET sensitizers, a plausible unitary mechanism can be proposed. This considers that reaction between R2S.+ and O2.- mainly involves back electron transfer, whereas sulfoxidation results primarily from the reaction of the sulfide radical cation with molecular oxygen. Calculations indeed show that the initially formed fleeting complex RS2 +⋯O-O. adds to a sulfide molecule and gives strongly stabilized R2S-O.-+O-SR2 via an accessible transition state. This intermediate gives the sulfoxide, probably via a radical cation chain path. This mechanism explains the larger scope of ET sulfoxidation with respect to the singlet-oxygen process. © 2006 Wiley-VCH Verlag GmbH & Co. KGaA. |l eng | |
| 593 | |a CHIDECAR-CONICET, Dep. Quim. Org., Ciudad Universidaria, 1428 Buenos Aires, Argentina | ||
| 593 | |a Dept. Org. Chem., University of Pavia, v. Taramelli 10, 27100 Pavia, Italy | ||
| 593 | |a ISOF-CNR, via P. Gobetti 101, 40129 Bologna, Italy | ||
| 690 | 1 | 0 | |a ELECTRON TRANSFER OXIDATION |
| 690 | 1 | 0 | |a PHOTOCHEMISTRY REACTION MECHANISMS |
| 690 | 1 | 0 | |a SULFIDES |
| 690 | 1 | 0 | |a ACETONITRILE |
| 690 | 1 | 0 | |a ELECTRON TRANSITIONS |
| 690 | 1 | 0 | |a NEGATIVE IONS |
| 690 | 1 | 0 | |a PHOTOLYSIS |
| 690 | 1 | 0 | |a PHOTOSENSITIVITY |
| 690 | 1 | 0 | |a QUENCHING |
| 690 | 1 | 0 | |a ELECTRON TRANSFER OXIDATION |
| 690 | 1 | 0 | |a PHOTOCHEMISTRY REACTION MECHANISMS |
| 690 | 1 | 0 | |a SULFIDES |
| 690 | 1 | 0 | |a SULFOXIDATION |
| 690 | 1 | 0 | |a SULFUR COMPOUNDS |
| 700 | 1 | |a Manet, I. | |
| 700 | 1 | |a Freccero, M. | |
| 700 | 1 | |a Fagnoni, M. | |
| 700 | 1 | |a Albini, A. | |
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