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The title compound, C18H17N3O2·CH4O, is a Schiff base compound, which is derived from the condensation of equimolar amounts of 4-amino­antipyrine and 4-hydroxy­benzaldehyde. In the crystal structure, the MeOH molecules are linked to the Schiff base molecules through intermolecular O—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C19H19N3O2, the 2-methoxy­phenyl ring is almost coplanar with the pyrazoline ring [dihedral angle 8.7 (4)°], while the phenyl ring forms a dihedral angle of 54.9 (2)° with the pyrazoline ring. [ABSTRACT FROM AUTHOR]

The title compound, C18H15BrClN3O2, was obtained by reacting 3-bromo-5-chloro­salicylic aldehyde and 4-amino­anti­pyrine. The structure displays a trans configuration about the imine C=N double bond. The N atom is also involved in an intra­molecular O—H⋯N hydrogen bond, which stabilizes the configuration. [ABSTRACT FROM AUTHOR]