The physical and chemical properties of Pyrazole and Pyrazoline molecules were theoreticallystudied by Gaussian 03, software with NMR and Molecular orbital calculations at B3LYP/6-31G andB3LYP/6-31+G(d) levels, in gas phase and solution. In this study a comparison effect of threesolvents with different dielectric constants on Pyrazole and Pyrazoline molecules in aspect energyinteraction between...

In the title compound, C(17)H(17)N(3)O(2), a derivative of 4-amino-anti-pyrine, the structure displays a trans configuration with respect to the imine C=N double bond. The pyrazoline ring is essentially planar and makes a dihedral angle of 55.80 (1)° with the phenyl ring.

The title compound, C(23)H(19)N(3)O(2), was synthesized by the 1,3-dipolar cyclo-addition reaction of N-phenyl-α-diazo-acetamide and chalcone. In the mol-ecule, the pyrazoline ring assumes an envelope conformation. Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure.

In the title mol-ecule, C(17)H(14)ClFN(2)O, the mean plane of the pyrazoline ring makes dihedral angles of 18.19 (1) and 83.51 (4)° with the 4-chloro-benzene and 4-fluoro-benzene rings, respectively. The two benzene rings make a dihedral angle of 76.11 (2)°. Weak inter-molecular C-H⋯O hydrogen bonds help stabilize the crystal structure.

We develop a pyrazoline-based fluorescent sensor for biological Zn(2+) detection. The sensor shows good binding selectivity for Zn(2+) over competing metal with 40-fold fluorescence enhancement in response to Zn(2+). The new probe is cell-permeable and can be used to detect intracellular zinc ions in living neuron cells.

In the title compound, C(21)H(16)Cl(2)N(2)O, the central pyrazoline ring makes dihedral angles of 90.1 (3) and 7.8 (3)°, with the pendant benzene ring and naphthalene ring system, respectively. In the crystal structure, weak C-H⋯O inter-actions lead to chains of mol-ecules.

In the title compound, C(24)H(24)N(2)O(4), the pendant benzene and naphthalene ring systems make dihedral angles of 87.9 (3) and 19.2 (3)°, respectively, with the central pyrazoline ring. In the crystal structure, weak C-H⋯O inter-actions help to establish the packing.

Background: Pyrazoline derivatives have been found to possess a broad spectrum of biological activities. Among various pyrazoline derivatives, 2-pyrazolines seem to be the most frequently studied. A variety of methods have been reported for the preparation of this class of compound. However, in spite of their potential utility, some of the reported methods suffer from drawbacks such as long rea...

Solutions of biologically active substances insoluble in water (thiosulfoesters, anthraquinone derivatives, pyrazoline) were obtained using a combined solvent and biogenic surfactants. For this purpose used rhamnolipids, their biocomplex with polysaccharides synthesized by the Pseudomonas SP strain. PS-17, trehalosolipids Rhodococcus erythropolis AU-1 strain, commercial biosurfactant surfactant...

Reaction between aromatic aldehydes and 3–methyl-1-phenyl-2-pyrazoline-5-one catalyzed by nano-SiO2/HClO4 in water under reflux provided a simple and efficient route for the synthesis of 4-((5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)(aryl)methyl)-3-methyl-1-phenyl-1H-pyrazol-5-ol derivatives in high yields.