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Optimizations with the spin-unrestricted DFT and MP2 methods were carried out with use of the "guess=(mix, always)" option of Gaussian98. The vertical singlet-triplet separation at the UB3LYP/ 6-31G(d) level was 48.6 kcal/mol, indicating that the presence of a nearby diradical structure is unlikely. Note also that no stable triplet state nearby the 6tt structure could be located at the UB3LYP/6-31G(d) level.
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The RMP2(full)/6-31G(d) optimization yielded 1.714 Å for this bond length.
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2 = 291.6/2.3RT - 0.0818.
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0344990489
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note
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4 KIE value by a factor of 1.005. This is clearly negligible.
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85
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0344559424
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note
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Note also that employing a scale factor of 0.5 is equivalent to using a temperature T = 350.85/0.5 = 701.7 K, at a scale factor of unity.
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The B3LYP/6-311+G(d, p) optimized geometries and energies of 1tt and 2cc are available in the Supporting Information.
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0344127893
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note
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In a study by Singleton and co-workers (ref 46j) on KIE in aliphatic and aromatic Claisen rearrangement, the tendency of theoretical methods to generally underpredict the secondary deuterium KIEs was noted. Of the three positions they investigated, the largest error involved the α-d substitution (see Table 3 in ref 46j). In contrast, their calculated KIE at the terminal position (γ-d), which should be compared with the present work, agreed satisfactorily with their new experimental results.
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100
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0344990488
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note
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2 KIEs in the two molecules.
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