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Two new 3,5-diaryl-1 H-pyrazoles: 3(5)-(4-tert-butylphenyl)-5(3)-(naphthalene-2-yl)-1 H-pyrazole ( 1) and 5-(4-(benzyloxy)phenyl)-3-(furan-2-yl)-1 H-pyrazole ( 2) were synthesized and characterized. Two strong ions peaks [2M] and [2M + Na] observed in the ESI-MS spectra are attributed to the dimerization process in solution formed by intermolecular N-H···N hydrogen bonds. The crystal structures have been determined by X-ray crystal structure analysis. Compound 1 exists as a pair of tautomers 1a and 1b, and its dimer [ R(6) motif] is formed by the tautomers 1a and 1b. Compound 2 only exists as a 2a tautomer, and interesting intermolecular N-H···O and O-H···N hydrogen bonds link two pyrazoles and two methanol molecules, leading to the formation of an R(10) dimer motif. [ABSTRACT FROM AUTHOR]

The molecule of the title compound, C17H13F3O3, exists in the enol form and displays a strong intramolecular O—H...O hydrogen bond. The trifluoromethyl group is disordered over two orientations in an approximate 2:1 ratio. [ABSTRACT FROM AUTHOR]

The molecules of the title compound, C25H24N2, are connected by intermolecular N—H...N hydrogen bonds to form dimers. The crystal packing is stabilized by van der Waals forces. [ABSTRACT FROM AUTHOR]

In the title compound, C25H24O2, the molecular structure exists in a cis-enol form which is stabilized by an intramolecular O—H...O hydrogen bond. This hydrogen bond is described as an approximately symmetrical hydrogen bond. The three methyl groups are disordered over two positions, with a site occupancy ratio of ca 4:1. [ABSTRACT FROM AUTHOR]