Acta Cryst. (2005). C61, o452-o456  [ doi:10.1107/S0108270105016720 ]

Hydrogen-bonded chains in isostructural 5-methyl-2-(4-methylphenyl)-7,8-dihydro-6H-cyclopenta[g]pyrazolo[1,5-a]pyrimidine, 2-(4-chlorophenyl)-5-methyl-7,8-dihydro-6H-cyclopenta[g]pyrazolo[1,5-a]pyrimidine and 2-(4-bromophenyl)-5-methyl-7,8-dihydro-6H-cyclopenta[g]pyrazolo[1,5-a]pyrimidine, and sheets of -stacked hydrogen-bonded chains in 2-(4-methoxyphenyl)-5-methyl-7,8-dihydro-6H-cyclopenta[g]pyrazolo[1,5-a]pyrimidine

J. Portilla, J. Quiroga, J. Cobo, J. N. Low and C. Glidewell

Formula: C₁₇H₁₇N₃, C₁₆H₁₄ClN₃, C₁₆H₁₄BrN₃ and C₁₇H₁₇N₃O

Online 22 June 2005

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