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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:
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0037077055
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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:
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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
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46
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2542441357
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note
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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.
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