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53849124274
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In a previous study of the N-methylquinolinium photosensitization of sulfide 4, α-methylstyrene and 1-phenylethanol were also found. The percentage of the two compounds varied during irradiation, reasonably, owing to dehydration promoted by the acidity formed during the irradiation see ref.[5b
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[5b]).
-
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46
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53849124969
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2/εa term is disregarded as no charge separation is involved.
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2/εa term is disregarded as no charge separation is involved.
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48
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0000135519
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As an example of the ionization potential of the ethyl radical, values between 8.11 and 8.24 eV have been reported, see: a B. Ruscic, J. Berkowitz, L. A. Curtiss, J. A. Pople, J. Chem. Phys. 1989, 91, 114;
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0034248250
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.) ≈ 1.00 V vs. SCE were estimated from the measured IP by the Miller equation, not taking into account the solvation energy which may heavily affect the result.
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.) ≈ 1.00 V vs. SCE were estimated from the measured IP by the Miller equation, not taking into account the solvation energy which may heavily affect the result.
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0001193680
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2CHSPh, see: F. G. Bordwell, X. Zhang, J. P. Cheng, J. Org. Chem. 1991, 56, 3216;
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0001233515
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lower values were proposed for related derivatives, see: E. Baciocchi, C. Rol, E. Scamosci, G. V. Sebastiani, J. Org. Chem. 1991, 56, 5498.
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55
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0012107209
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In related compounds it was found that the C-H energy changes by ≤1 kcal/mol when an EtS is substituted for a PhS group
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0000628641
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.+ and thus BDFE reasonably negative for both radical cations.
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57
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0032554060
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See, for example: a
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53849112913
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In the case of the benzyl cation, ΔG, 23.06[E°(A., E°PhCH2 , 37.3 kcal mol-1 with DCA and -25.4 kcal mol -1 with TPP, with PhCMe2, 24.2 and -28.8 kcal mol-1, and with Ph2CH+ 28.8 and 16.1 kcal mol-1
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60
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0035915374
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The oxidation potential of α-thioalkyl radicals should not be significantly different to those of α-hydroxyalkyl radicals e.g, Me 2C.OH, 0.61 V vs. SCE, a value affected by a large uncertainty, which would make oxidation, at least by TPP, viable, see: T. Lund, D. D. M. Wayner, M. Jonsson, A. G. Larsen, K. Daasbjerg, J. Am. Chem. Soc. 2001, 123, 12590
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53849135152
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[5,6] although in every case subsequent paths from such intermediates to the sulfoxide are strongly exothermic.
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[5,6] although in every case subsequent paths from such intermediates to the sulfoxide are strongly exothermic.
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53849114266
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Flash photolysis experiments with the Ph2S/TPP+ system showed no oxygen quenching of either the sulfide radical cation or of TPP.[6, whereas the lifetimes of both R2S, and DCA, was shortened in the corresponding experiments with DCA because of ET to O2 from the latter and reaction with O 2, of the former, path e, This proves that the rate constant for the reaction of both intermediates is kO2 < 1 × 106 M-1 S-1, but does not preclude this process having a role in steady-state experiments. Indeed, the reaction rate of R2S, with oxygen depends linearly on the intermediate concentration and thus on the intensity of the absorbed light flux, k[Intermediate][O2, rather than on the square of the flux as the reaction with superoxide, k[Intermediate] 2
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2 is more competitive at the low flux of steady-state irradiation than in flash experiments.
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73
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0002018403
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