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Volumn 110, Issue 6, 2006, Pages 2195-2203

Mechanistic insights into NO 3 ̇ induced self-terminating radical oxygenations, part 1: A computational study on NO 3 ̇ and its addition to alkynes

Author keywords

[No Author keywords available]

Indexed keywords

HARTREE-FOCK (HF); HYBRID DENSITY FUNCTIONALS; METHYL GROUP;

EID: 33644783053     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp0454772     Document Type: Article
Times cited : (28)

References (88)
  • 9
    • 33644776396 scopus 로고    scopus 로고
    • note
    • A mechanistic scheme for a typical self-terminating radical oxygenation is given in the electronic Supporting Information.
  • 10
    • 33644753565 scopus 로고    scopus 로고
    • The calculations of the remaining reaction steps of the self-terminating radical oxygenation sequence will be presented separately: Dreessen, T.; Wille, U. Unpublished results
    • The calculations of the remaining reaction steps of the self-terminating radical oxygenation sequence will be presented separately: Dreessen, T.; Wille, U. Unpublished results.
  • 30
    • 0000328284 scopus 로고
    • Symmetry breaking is an artifact caused by an inadequately approximated solution of the electronic Schrödinger equation and is frequently encountered in computations of highly symmetric open-shell molecules; see for example: (a) McLean, A. D.; Lengsfeld, B. H., III; Pacansky, J.; Ellinger, Y. J. Chem. Phys. 1985, 83, 3567.
    • (1985) J. Chem. Phys. , vol.83 , pp. 3567
    • McLean, A.D.1    Lengsfeld III, B.H.2    Pacansky, J.3    Ellinger, Y.4
  • 47
    • 0003754095 scopus 로고
    • Ziesche, P., Eschrig, H., Eds.; Akademie Verlag: Berlin
    • (a) Perdew, J. P. In Electronic Structure of Solids'91; Ziesche, P., Eschrig, H., Eds.; Akademie Verlag: Berlin, 1991.
    • (1991) Electronic Structure of Solids'91
    • Perdew, J.P.1
  • 69
    • 33644782400 scopus 로고    scopus 로고
    • note
    • This energy difference is lesser than the precision that normally is assigned to the theoretical methods.
  • 72
    • 33644764535 scopus 로고    scopus 로고
    • note
    • In our computations, basis sets with diffuse functions generally resulted in higher absolute values for the atomic charges and dipole moments (see Supporting Information).
  • 73
    • 84858562644 scopus 로고    scopus 로고
    • Accessed 2000
    • o was determined according to: Ochterski, J. W. http://www.gaussian.com/g_whitepap/thermo.htm (Accessed 2000).
    • Ochterski, J.W.1
  • 74
    • 33644751420 scopus 로고    scopus 로고
    • note
    • -1, they were not further considered.
  • 75
    • 33644767731 scopus 로고    scopus 로고
    • note
    • Since this supermolecule is not symmetric at all, no symmetry breaking problems should appear.
  • 77
    • 0004125345 scopus 로고
    • John Wiley & Sons: Chichester
    • No attempt was made in this work to locate the transition state of the Z/E isomerization of the vinyl radicals because of the expected low activation barrier and its insignificance for the course of the radical oxygenation cascade; see also: Fossey, J.; Lefort, D.; Sorba, J. Free Radicals in Organic Chemistry; John Wiley & Sons: Chichester, 1995.
    • (1995) Free Radicals in Organic Chemistry
    • Fossey, J.1    Lefort, D.2    Sorba, J.3
  • 78
    • 33644755229 scopus 로고    scopus 로고
    • note
    • ̇ to alkynes to benchmark our computational results. The rates of these reactions are on the lower limit accessible by the fast-flow techniques that were used for their determination, and the obtained data are consequently afflicted with significant errors; see refs 1 and 23a-d.
  • 79
    • 33644785550 scopus 로고    scopus 로고
    • note
    • The B3LYP method is well-known to underestimate the size of activation barriers in radical reactions; see ref 22b.
  • 80
    • 33644765555 scopus 로고    scopus 로고
    • note
    • ̇ attack at the higher substituted site of the C≡C triple bond was not investigated; see ref 22c and:
  • 83
    • 33644752473 scopus 로고    scopus 로고
    • note
    • NOC1C2 of ca. 180° were located as transition states of the rotation between the two enantiomers of E-p and Z-p, respectively (not shown).
  • 84
    • 33644786657 scopus 로고    scopus 로고
    • note
    • ̇ with ethyne.
  • 85
    • 33644777292 scopus 로고    scopus 로고
    • note
    • 1.
  • 87
    • 33644751421 scopus 로고    scopus 로고
    • note
    • This might be because DFT methods cannot reproduce intermolecular interactions well. The calculated geometries for complex-e/p/b showed indeed the largest dependencies on the theoretical level of theory used in this work (see Supporting Information).
  • 88
    • 0042232501 scopus 로고    scopus 로고
    • Similar to our results, it was found that addition of methyl and phenyl radicals to ethyne or propyne leads, via Z-configurated transition states, to Z-configurated vinyl radicals; see refs 36a and: Gómez-Balderas, R.; Coote, M. L.; Henry, D. J.; Fischer, H.; Radom, L. J. Phys. Chem. A 2003, 107, 6082.
    • (2003) J. Phys. Chem. A , vol.107 , pp. 6082
    • Gómez-Balderas, R.1    Coote, M.L.2    Henry, D.J.3    Fischer, H.4    Radom, L.5


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.