Open AccessHydrogen‐bonded chains in isostructural 5‐methyl‐2‐(4‐methylphenyl)‐7,8‐dihydro‐6 H ‐cyclopenta[ g ]pyrazolo[1,5‐ a ]pyrimidine, 2‐(4‐chlorophenyl)‐5‐methyl‐7,8‐dihydro‐6 H ‐cyclopenta[ g ]pyrazolo[1,5‐ a ]pyrimidine and 2‐(4‐bromophenyl)‐5‐methyl‐7,8‐dihydro‐6 H ‐cyclopenta[ g ]pyrazolo[1,5‐ a ]pyrimidine, and sheets of π‐stacked hydrogen‐bonded chains in 2‐(4‐methoxyphenyl)‐5‐methyl‐7,8‐dihydro‐6 H ‐cyclopenta[ g ]pyrazolo[1,5‐ a ]pyrimidine
Author(s) -
Portilla Jaime,
Quiroga Jairo,
Cobo Justo,
Low John N.,
Glidewell Christopher
Publication year - 2005
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
eISSN - 1600-5759
pISSN - 0108-2701
DOI - 10.1107/s0108270105016720
Subject(s) - isostructural , pyrimidine , chemistry , hydrogen bond , molecule , stacking , stereochemistry , crystallography , crystal structure , organic chemistry
5‐Methyl‐2‐(4‐methylphenyl)‐7,8‐dihydro‐6 H ‐cyclopenta[ g ]pyrazolo[1,5‐ a ]pyrimidine, C 17 H 17 N 3 , 2‐(4‐chlorophenyl)‐5‐methyl‐7,8‐dihydro‐6 H ‐cyclopenta[ g ]pyrazolo[1,5‐ a ]pyrimidine, C 16 H 14 ClN 3 , and 2‐(4‐bromophenyl)‐5‐methyl‐7,8‐dihydro‐6 H ‐cyclopenta[ g ]pyrazolo[1,5‐ a ]pyrimidine, C 16 H 14 BrN 3 , are isostructural; in each compound, the molecules are linked into chains by a single C—H⋯π(arene) hydrogen bond. Molecules of 2‐(4‐methoxyphenyl)‐5‐methyl‐7,8‐dihydro‐6 H ‐cyclopenta[ g ]pyrazolo[1,5‐ a ]pyrimidine, C 17 H 17 N 3 O, are linked by a single C—H⋯N hydrogen bond into chains, which are themselves linked into sheets by a π–π stacking interaction.