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Volumn 68, Issue 25, 2003, Pages 9635-9642

Transition Structures, Energetics, and Secondary Kinetic Isotope Effects for Cope Rearrangements of cis-1,2-Divinylcyclobutane and cis-1,2-Divinylcyclopropane: A DFT Study

Author keywords

[No Author keywords available]

Indexed keywords

TRANSITION STRUCTURES;

EID: 0345097548     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo035173w     Document Type: Article
Times cited : (43)

References (100)
  • 1
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    • Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Pergamon Press: Oxford, UK
    • Hill, R. K. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Pergamon Press: Oxford, UK, 1991; Vol. 5, pp 785-826.
    • (1991) Comprehensive Organic Synthesis , vol.5 , pp. 785-826
    • Hill, R.K.1
  • 2
    • 0000729612 scopus 로고
    • Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Pergamon Press: Oxford, UK
    • Bronson, J. J.; Danheiser, R. L. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Pergamon Press: Oxford, UK, 1991; Vol. 5, pp 999-1035.
    • (1991) Comprehensive Organic Synthesis , vol.5 , pp. 999-1035
    • Bronson, J.J.1    Danheiser, R.L.2
  • 3
    • 0000065841 scopus 로고
    • Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Pergamon Press: Oxford, UK
    • Piers, E. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Pergamon Press: Oxford, UK, 1991; Vol. 5, pp 971-998.
    • (1991) Comprehensive Organic Synthesis , vol.5 , pp. 971-998
    • Piers, E.1
  • 19
    • 0343655351 scopus 로고
    • Part I; de Mayo, P., Ed.; Wiley: New York
    • (a) Rhoads, S. J. In Molecular Rearrangements, Part I; de Mayo, P., Ed.; Wiley: New York; 1963; p 655.
    • (1963) Molecular Rearrangements , pp. 655
    • Rhoads, S.J.1
  • 41
    • 0344559429 scopus 로고    scopus 로고
    • note
    • 17 However, from the energies reported in the Supporting Information of ref 17, the activation barrier has been calculated to be 31.4 kcal/mol, which agrees with that in the present study.
  • 44
  • 74
    • 0344559428 scopus 로고    scopus 로고
    • note
    • 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.
  • 75
    • 0344990490 scopus 로고    scopus 로고
    • note
    • The RMP2(full)/6-31G(d) optimization yielded 1.714 Å for this bond length.
  • 76
    • 0001945228 scopus 로고
    • It should be noted that the definition of KIE in terms of free energies is exactly equivalent to the Bigeleisen-Mayer formulation (Biegeleisen, J.; Wolfsberg, M. Adv. Chem. Phys. 1958, 1, 15), which was sometimes employed in previous work (see ref 11c). Use of a few free energy values instead of a multitude of (3N - 6) frequencies is obviously more convenient.
    • (1958) Adv. Chem. Phys. , vol.1 , pp. 15
    • Biegeleisen, J.1    Wolfsberg, M.2
  • 77
    • 0344559427 scopus 로고    scopus 로고
    • note
    • D, the subscripts H and D should be reversed.
  • 80
    • 0000394180 scopus 로고
    • Advances in Chemistry Series; American Chemical Society: Washington, DC
    • (a) Ishida, T.; Spindel, W. In Isotope Effects in Chemical Processes; Advances in Chemistry Series; American Chemical Society: Washington, DC, 1969; Vol. 89, pp 192-247.
    • (1969) Isotope Effects in Chemical Processes , vol.89 , pp. 192-247
    • Ishida, T.1    Spindel, W.2
  • 83
    • 0344559425 scopus 로고    scopus 로고
    • note
    • 2 = 291.6/2.3RT - 0.0818.
  • 84
    • 0344990489 scopus 로고    scopus 로고
    • note
    • 4 KIE value by a factor of 1.005. This is clearly negligible.
  • 85
    • 0344559424 scopus 로고    scopus 로고
    • note
    • 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.
  • 87
    • 0344127894 scopus 로고    scopus 로고
    • note
    • The B3LYP/6-311+G(d, p) optimized geometries and energies of 1tt and 2cc are available in the Supporting Information.
  • 99
    • 0344127893 scopus 로고    scopus 로고
    • note
    • 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.
  • 100
    • 0344990488 scopus 로고    scopus 로고
    • note
    • 2 KIEs in the two molecules.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.