Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 5 (May 2002)

Acta Cryst. (2002). C58, o305-o310 [doi:10.1107/S0108270102006200]

The molecular and supramolecular structures of four 1,5,6,10b-tetrahydropyrazolo[1,5-c]quinazolines

J. N. Low, J. Cobo, M. Nogueras, A. Sánchez, H. Torres and B. Insuasty

Abstract: The supramolecular structures of the title compounds, 2-phenyl-5-p-tolyl-1,5,6,10b-tetrahydropyrazolo[1,5-c]quinazoline, C₂₃H₂₁N₃, (I), 5-(4-bromophenyl)-2-phenyl-1,5,6,10b-tetrahydropyrazolo[1,5-c]quinazoline, C₂₂H₁₈BrN₃, (II), 2-(4-chlorophenyl)-5-phenyl-1,5,6,10b-tetrahydropyrazolo[1,5-c]quinazoline, C₂₂H₁₈ClN₃, (III), and 5-(4-bromophenyl)-2-(4-chlorophenyl)-1,5,6,10b-tetrahydropyrazolo[1,5-c]quinazoline, C₂₂H₁₇BrClN₃, (IV), are of two general types. Compounds (I), (II) and (III) form base-paired dimers via N-HN hydrogen bonds, where (I) and (II) are isomorphous, while in (IV), there are no conventional hydrogen bonds.

Formula: C₂₃H₂₁N₃, C₂₂H₁₈BrN₃, C₂₂H₁₈ClN₃ and C₂₂H₁₇BrClN₃

Online 30 April 2002


	Structure factor file (CIF format) (195.7 kbytes) Contains datablock I

	Structure factor file (CIF format) (185.0 kbytes) Contains datablock II

	Structure factor file (CIF format) (196.2 kbytes) Contains datablock III

	Structure factor file (CIF format) (205.2 kbytes) Contains datablock IV

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