Abstract

3-Dimethylamino-1,2,4-triazine has been prepared and the hindered rotation around the exocyclic C-N bond has been studied by a complete lineshape method. CNDO/2 calculations on dimethylamino derivatives of pyridine, pyrimidine, 1,2,4-triazine and 1,3,5-triazine have been performed, and it is found that the calculations satisfactorily reproduce the experimental data. The barrier heights are also discussed in terms of total and π-charge densities obtained from CNDO/2 calculations.

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