A. Kakehi,, K. Kitajima, S. Ito
May 15, 1995
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Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
The pyrazole and pyridine rings in the pyrazolo[1,5-a]pyridine skeleton of 1-ethyl-2-oxo-1,2-dihydrodipyrido[1,2-b:3',2'-d]pyrazole-3-carbonitrile, C 13 H 10 N 4 O, are planar [maximum deviations 0.004 (3) and 0.004 (3) A, respectively], and are almost coplanar to each other with a dihedral angle of 0.9 (3)°. The planar 2-pyridone ring (fused to the pyrazolol[1,5-a]pyridine ring at the 2- and 3-positions) is also nearly coplanar with the pyrazolo[1,5-a]pyridine ring [maximum deviation 0.032 (3) A, dihedral angle 0.9 (3)°]. The delocalized ring system extends to the fused 2-pyridone ring