2,5-Dimethyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline and 2-tert-butyl-5-methyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline.
In both 2,5-dimethyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline, C(16)H(15)N(3), (I), and 2-tert-butyl-5-methyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline, C(19)H(21)N(3), (II), which crystallizes with Z' = 2 in the space group P\overline{1}, the non-aromatic carbocyclic rings adopt screw-boat conformations. The molecules of (I) are linked into chains of rings by a combination of C-H...N and C-H...pi(arene) hydrogen bonds, while in (II) there are no hydrogen bonds of any kind.
Portilla
Jaime
J
Grupo de Investigación de Compuestos Heterocíclicos, Departamento de Química, Universidad de Valle, AA 25360, Colombia.
Quiroga
Jairo
J
Cobo
Justo
J
Low
John N
JN
Glidewell
Christopher
C