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54249121250
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note
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For the formation of enone (E) and adduct (A) in dichloromethane and acetonitrile, see Tables 1 and 2 in Ref. 1.
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-
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8
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-
54249114004
-
-
note
-
Corresponding to the full width at half maximum (fwhm) of the Gaussian bandshape.
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9
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E. Guerry-Butty, E. Haselbach, C. Pasquier, P. Suppan and D. Phillips, Helv. Chim. Acta, 1985, 68, 912.
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H. Kobashi, H. Gyoda and T. Morita, Bull. Chem. Soc. Jpn., 1977, 50, 1731.
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H. Kobashi, M. Funabashi, T. Kondo, T. Morita, T. Okada and N. Mataga, Bull. Chem. Soc. Jpn., 1984, 57, 3557.
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See also K. Kawai, Y. Shirota, H. Tsubomura and H. Mikawa, Bull. Chem. Soc. Jpn., 1972, 45, 77;
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E. F. Hilinski, S. V. Milton and P. M. Rentzepis, J. Am. Chem. Soc., 1983, 105, 5193;
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See also Ref. 8
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54249164518
-
-
note
-
(a) Note that the white light continuum for the picosecond laser-flash system only extended to 400 nm. (b) On the other hand, the extended spectral range of the nanosecond time-resolved spectrometer allowed the reactive intermediates to be observed in the wavelength region from 300 to 900 nm.
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-
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18
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0000318373
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.+ (which absorbs visible light) is due to the π conjugation of the alkene cation-radical moiety with the phenyl substituent. See R. Rathore and J. K. Kochi, J. Org. Chem., 1996, 61, 627.
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.+ closely resembles those of styrene cation radicals, as described by L. J. Johnston and N. P. Schepp, J. Am. Chem. Soc., 1993, 115, 6564.
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54249111840
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note
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.+ occurred simultaneously in dichloromethane on the 1 to 3 ns timescale to a weak residual absorption of the hydrochloranil radical (vide infra).
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21
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0001029781
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S. K. Wong, L. Fabes, W. J. Green and J. K. S. Wan, J. Chem. Soc., Faraday Trans. 1, 1972, 68, 2211.
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Compare T. M. Bookman, K. Y. Lee and J. K. Kochi, J. Chem. Soc., Perkin Trans. 2, 1992, 1581.
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Dekker, New York, 2nd ed.
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Murov, S.L.1
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54249102608
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note
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-1, respectively, that were formed in more or less equimolar amounts according to eqn. (2). Moreover, the simultaneous growth of the 450 and 550 nm absorbances were roughly comparable (τ ∼ 0.7 ns).
-
-
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25
-
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54249169079
-
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note
-
-6 M.
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26
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54249161413
-
-
note
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Note the quenching rate constant for 2-phenycyclohexanone enol silyl ether 9 in Table 2 (entry 6) was unusually slow (vide infra).
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27
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54249097407
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note
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1:, in eqn. (3). (See ref. 18).
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29
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54249086619
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note
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., and it was assigned to the silyl-substituted hydrochloranil radical.
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1 2b (d) Furthermore, the same two bands were observed upon the photoinduced electron transfer of enol silyl ether 9 (in the presence of benzophenone and 1,2,4,5-tetracyanobenzene) by the procedure described by P. K. Das, J. Chem. Soc., Faraday Trans. 1, 1983, 79, 1135.
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54249170525
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1
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39
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note
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40
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54249143951
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note
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41
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54249089352
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note
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note
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40
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50
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54249165433
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See Murov et al. in, Ref 16b p. 19
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See Murov et al. in, Ref 16b p. 19.
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51
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Silyl enol ethers have been identified as viable electron donors by the combination of spectral, electrochemical and photoionization methods. See R. Rathore and J. K. Kochi, Tetrahedron Lett., 1994, 35, 8577.
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54249122143
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.+ in acetonitrile precludes a salt-effect study, and it is not possible to identify definitively the initially-formed ion pair in this solvent. It is likely that the contact radical-ion pair is first formed in both solvents, in view of the identity of the quenching processes in dichloromethane and acetonitrile.
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54249124495
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See Table 4 in Ref. 1
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See Table 4 in Ref. 1.
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54249159171
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This exchange occurs at high (ca. 0.1 M) salt concentrations (normal salt effect) and should be distinguished from the interception of solvent-separated ion pairs (special salt effect) discussed earlier.
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54249091148
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54249136290
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107
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0039602832
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M. R. Novice, H. R. Seikaly, A. D. Seiz and T. T. Tidwell, J. Am. Chem. Soc., 1980, 102, 5835.
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(1980)
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Novice, M.R.1
Seikaly, H.R.2
Seiz, A.D.3
Tidwell, T.T.4
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108
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54249117218
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note
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77
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