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- W2044099818 abstract "Resonance Energy of Diradicals. — 1,8‐Naphthoquinodimethane From the racemization of 19c and the temperature and NO dependence of the trapping rate of 20b between 218 and 288°C the energy profile for the equilibrium 19b ⇄ 20b is derived. The singlet‐triplet splitting of the diradical is 2.5 kcal · mol ‐1 with the triplet being the ground state. By comparison of the experimental reaction enthalpy with the analogous value for 25, 26 or a hypothetical model reaction with non‐interacting radicals it is shown that the stabilizing interaction of the radicals in the singlet state of 20b is negligible making the stabilization of the triplet equivalent to the singlet‐triplet splitting. By using literature data it is shown by an analogous analysis that the interaction of the radicals in the bisallyl diradical 28 and in the triplet state of the trimethylenmethane derivative 29 is also negligible whereas in the singlet state of 29 the interaction is strongly destabilizing." @default.
- W2044099818 created "2016-06-24" @default.
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- W2044099818 date "1996-12-01" @default.
- W2044099818 modified "2023-09-24" @default.
- W2044099818 title "Resonanzenergie von Diradikalen — 1,8-Naphthoquinodimethan" @default.
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- W2044099818 doi "https://doi.org/10.1002/jlac.199619961230" @default.
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