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Volumn 679, Issue 1-2, 2004, Pages 53-58

Structure of pyridynes and pyridyne N-oxides and their cycloaddition to ketene dialkyl acetals

Author keywords

Cycloaddition; Density functional calculations; Pyridyne formation energy; Pyridynes

Indexed keywords

ACETAL DERIVATIVE; KETENE DERIVATIVE; OXIDE; PYRIDINE; PYRIDINE DERIVATIVE;

EID: 2542437992     PISSN: 01661280     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.theochem.2004.04.002     Document Type: Article
Times cited : (12)

References (47)
  • 42
    • 2542499504 scopus 로고
    • The reaction of 3-chloro-2-picoline N-oxide with potassium amide to give 3- or 4-amino-2-picoline 1-oxyde seems to involve the formation of 3,4-pyridyne N-oxide, see:
    • The reaction of 3-chloro-2-picoline N-oxide with potassium amide to give 3- or 4-amino-2-picoline 1-oxyde seems to involve the formation of 3, 4-pyridyne N-oxide, see: Kato T., Niitsuma T. Heterocycles. 1:1973;233-236
    • (1973) Heterocycles , vol.1 , pp. 233-236
    • Kato, T.1    Niitsuma, T.2
  • 43
    • 0037077055 scopus 로고    scopus 로고
    • The simplest case, a 1,4-diradical C(a)-C2-C(b) can be obtain from a hydrocarbon by the homolytic cleavage of two CH bonds. Two pathways occurs C(a)H-C2-C(b)H→(C(a)-C2-C(b)H→(C(a)-C2-C(b) or C(a)H-C2-C(b) H→(C(a)H-C2-C(b)→(C(a)-C2-C(b). We assume that the thermodynamic stability of the diradical is not affected by the pathway followed for its generation (the presence of one radical center does not affect the enthalpy for creation of the second radical center). For a discussion, see:
    • The simplest case, a 1, 4-diradical C(a)-C2-C(b) can be obtain from a hydrocarbon by the homolytic cleavage of two CH bonds. Two pathways occurs C(a)H-C2-C(b)H→(C(a)-C2-C(b)H→(C(a)-C2-C(b) or C(a)H-C2-C(b) H→(C(a)H-C2-C(b)→(C(a)-C2-C(b). We assume that the thermodynamic stability of the diradical is not affected by the pathway followed for its generation (the presence of one radical center does not affect the enthalpy for creation of the second radical center). For a discussion, see: Zhang D.Y., Borden W.T. J. Org. Chem. 67:2002;3989-3995
    • (2002) J. Org. Chem. , vol.67 , pp. 3989-3995
    • Zhang, D.Y.1    Borden, W.T.2
  • 46
    • 2542441357 scopus 로고    scopus 로고
    • note
    • Calculated at the Becke3LYP/6-311G(d, p) level (energy in hartrees), 3-methylpyridin-4-yl radical: total energy, -286.99267, ZPE (scaled by a factor of 0.989 [18]), 0.10155; 4-methylpyridin-3-yl radical: total energy, -286.99161, ZPE (scaled by a factor of 0.989 [18]), 0.10275.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.