93 research outputs found
4-[2-(1-Acetyl-2-oxopropylidene)hydrazino]-N-(pyrimidin-2-yl)benzenesulfonamide
In the title compound, C15H15N5O4S, the dihedral angle between the pyrimidine and benzene rings is 84.56 (2)°. Intramolecular hydrazine–carbonyl N—H⋯O and intermolecular sulfonamide–pyridimine N—H⋯N hydrogen bonds stabilize the molecular and crystal structures, respectively
3-(2,4-Dichlorophenyl)-5-(4-fluorophenyl)-2-methyl-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidine
In the title compound, C20H11Cl2F4N3, the central pyrazolo[1,5-a]pyrimidine unit is almost planar [the mean deviation from the best least-square plane through the nine atoms is 0.006 (2) Å]. The fluorobenzene ring is rotated out of this plane by 10.3 (3)°, whereas the dichlorobenzene ring is rotated by 46.2 (3)°. The crystal packing is dominated by Cl⋯Cl interactions of 3.475 (3) Å and van der Waals interactions
2-Methyl-5-(4-tolyl)-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidine
In the title compound, C15H12F3N3, the pyrazolo[1,5-a]pyrimidine system ring is essentially planar with a maximum deviation from the mean plane of 0.014 (1) Å. The 4-tolyl group makes a dihedral angle of 14.1 (1)° with the pyrazolo[1,5-a]pyrimidine ring system. The crystal packing is stabilized mainly by van der Waals forces
ChemInform Abstract: RING OPENING OF 5,7-DIMETHYL-V-TRIAZOLO(1,5-A)PYRIMIDINE BY HALOGENATING AGENTS
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