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14b In each case, the fully optimized TS's were characterized by one and only one imaginary frequency corresponding to the concerted cycloaddition. No account has been made of zero point energy corrections. Though these corrections are not negligible in barrier height calculations, they probably become negligible in selectivity studies where similar reactions are compared
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14b In each case, the fully optimized TS's were characterized by one and only one imaginary frequency corresponding to the concerted cycloaddition. No account has been made of zero point energy corrections. Though these corrections are not negligible in barrier height calculations, they probably become negligible in selectivity studies where similar reactions are compared.
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The percentage of adducts have been evaluated assuming that the product distribution is under kinetic control and the relative percentages were then calculated in the context of the transition state theory at 300°K
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The percentage of adducts have been evaluated assuming that the product distribution is under kinetic control and the relative percentages were then calculated in the context of the transition state theory at 300°K.
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85038205774
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Additional AM1 calculations reveal interesting trends concerning the LUMO of 1. Indeed, the C5 coefficient (0.49) is significantly larger than the C2 coefficient (0.42). Substituting the 4-bromo substituent by a hydrogen leads to similar C5 and C2 coefficients (0.45 and 0.43 respectively). Retaining the bromo substituent and substituting the carbonyl group by a methylene again leads to significantly different C5 and C2 coefficients (0.58 and 0.49 respectively). From these AM1 results, it appears that the 4-bromo substituent generates a larger LUMO CS coefficient and thus, this bromo effect may lead to an enhanced regioselectivity
-
Additional AM1 calculations reveal interesting trends concerning the LUMO of 1. Indeed, the C5 coefficient (0.49) is significantly larger than the C2 coefficient (0.42). Substituting the 4-bromo substituent by a hydrogen leads to similar C5 and C2 coefficients (0.45 and 0.43 respectively). Retaining the bromo substituent and substituting the carbonyl group by a methylene again leads to significantly different C5 and C2 coefficients (0.58 and 0.49 respectively). From these AM1 results, it appears that the 4-bromo substituent generates a larger LUMO CS coefficient and thus, this bromo effect may lead to an enhanced regioselectivity.
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34
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24b an hypothetical s-cis,s-trans structure is shown to rearrange to the s-trans,s-trans conformer
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24b an hypothetical s-cis,s-trans structure is shown to rearrange to the s-trans,s-trans conformer.
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For instance, the s-cis methyl formate is more stable than the s-trans conformer by about 5-6 kcal/mol. For a discussion on this point, including experimental data and ab initio calculations, see Eliel, E.L.; Wilen, S.H. Stereochemistry of Organic Compounds; Wiley: New-York, 1994.
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