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Even though this view has been challenged,16 it has been upheld in subsequent studies.14
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See the Supporting Information paragraph at the end of this paper
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See the Supporting Information paragraph at the end of this paper.
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However, two chlorine substituents in ortho positions lead to a strong steric effect.12
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60
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33846958261
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2 would also show a slight increase due to an enhanced electronic push by the electron pairs on the aryloxy group oxygen.
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2 would also show a slight increase due to an enhanced electronic push by the electron pairs on the aryloxy group oxygen.
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The σP values for 4-CF3, 4-CN, 4-CHO, and 4-NO2 are 0.54, 0.66, 0.42, and 0.78, respectively, while the σP- values are 0.56, 0.99, 0.98, and 1.28, respectively.28 Hence, the Δσ, σP, σP values for 4-CF3, 4-CN, 4-CHO, and 4-NO 2 are 0.02, 0.33, 0.56, and 0.49, respectively. σR values, another measure of π-acceptor strength, yield the same qualitative order: 0.09 (4-CF3, 0.18 (4-CN, 0.23 (4-CHO, and 0.16 (4-NO 2).28
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28
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The Marcus intrinsic barrier of a reaction is the barrier in the absence of a thermodynamic driving force, i.e, when ΔG°, 0. 30
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Bernasconi, C. F.; Brown, S. D.; Ali, M.; Rappoport, Z.; Yamataka H.; Salim, H. J. Org. Chem. 2006, 71, 4795.
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Bernasconi, C.F.1
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Yamataka, H.5
Salim, H.6
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Other factors such as the smaller electron withdrawing inductive effect of the MeS group compared to MeO and PhO groups contribute to differences in the k1OH values.2c
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2c
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Pulley, S. R.; Sen. S.; Vogorushin, A.; Swanson, E. Org. Lett. 1999, 1, 1721.
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Pulley, S.R.1
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