First synthesis of 5,8-dichloro-3-(2-pyridyl)benzo[e][1,2,4]triazines by reaction of 3,3,6,6-tetrachloro-1,2-cyclohexanedione with 2-pyridylamidrazones. Characterization of unexpected bishemiaminal intermediates

1. Guirado, A.
2. López Sánchez, J.I.
3. Moreno, R.
4. Gálvez, J.