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In the crystal structure of the title compound, C20H20N2O4, the mol­ecules are linked by a weak inter­molecular C—H⋯N hydrogen bond. The molecule has crystallographic twofold rotation symmetry. [ABSTRACT FROM AUTHOR]

The title compound, C16H15F3N2O3, is composed of a 3-(tri­fluoro­methyl)­phenyl ring and a pyridazinone ring, which are approximately coplanar, and an ethyl acetate group on the pyridazinone ring. In the crystal structure, centrosymmetric­ally related mol­ecules form dimers through non-classical intermolecular C—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The tetra­hydro­pyrimidine ring of the title mol­ecule, C12H14N2OS, adopts a half-chair conformation. In the crystal structure, the mol­ecules are linked to form centrosymmetric­ally related hydrogen-bonded dimers. [ABSTRACT FROM AUTHOR]

The article presents information related to the organic compound 3-(2-Chlorobenzyl)-2-thioxoperhydro-pyrimidin-4-one. The tetrahydropyrimidine ring of the compound adopts a half-chair conformation. The derivatives of uracil and thiouracil are known for their varied bioactivity. Lenacil, bromacil, butafenacil, flupropacil, isocil and terbacil are widely used as herbicides. Some of them possess antidiabetic activity. This led researchers to pay more attention to the synthesis and structure determination of these compounds.

In the title molecule, C18H18ClN5O2, the central pyrazole ring is perpendicular to the benzene ring and approximately perpendicular to the pyridazine ring [dihedral angles 89.9 (2) and 82.8 (2)°, respectively]. [ABSTRACT FROM AUTHOR]

The pyrazolo[1,5- a]pyrimidine ring system of the title compound, C15H12N4S, is essentially planar and the dihedral angle between the plane of the pyrazolo[1,5- a]pyrimidine system and the plane of the phen­yl ring is 134.6 (7)°. [ABSTRACT FROM AUTHOR]

The title mol­ecule, C11H9FN2O, was synthesized from 3,6-difluoro­pyridazine, benz­yl alcohol and sodium hydro­xide in CH3CN under reflux. The asymmetric unit contains two independent mol­ecules with nearly identical geometry. In the crystal structure, the mol­ecules are linked by weak inter­molecular C—H⋯F hydrogen bonds and C—H⋯π inter­actions. [ABSTRACT FROM AUTHOR]

In the title compound, C14H15ClN2O, the benzene and pyrimidine rings are nearly perpendicular, the dihedral angle between them being 84.7 (2)°. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound, C9H9ClN4, there are non-classical intramolecular C—H⋯N hydrogen bonds and intermolecular C—H⋯π interactions. [ABSTRACT FROM AUTHOR]

The title compound, C12H16N4O4S, is composed of two substituted pyrazole rings, which are connected through a sulfone group. The dihedral angle between the two pyrazole rings is 79.1 (1)°. The ethoxy­carbonyl substituent is planar and is slightly twisted away from the attached pyrazole ring. [ABSTRACT FROM AUTHOR]

The tetra­hydro­pyrimidine ring of the title mol­ecule, C11H11FN2OS, adopts a half-chair conformation. In the crystal structure, the mol­ecules are linked to form centrosymmetric hydrogen-bonded dimers. [ABSTRACT FROM AUTHOR]

In the title compound, C18H18ClN5O2, there are two independent mol­ecules in the asymmetric unit. In both mol­ecules, the pyrimidine ring is almost coplanar with the central pyrazole ring, while the benzene ring is almost perpendicular to it. [ABSTRACT FROM AUTHOR]

The title mol­ecule, C17H25N5O3S2, belongs to the family of bis-heterocycles. In the crystal structure, there are one intra- and two inter­molecular hydrogen bonds. One of the two pyrazole rings and the six-membered ring formed by the intra­molecular hydrogen bond are approximately coplanar. [ABSTRACT FROM AUTHOR]

The crystal structure of the title compound, C18H20N6O3, is stabilized by N—H⋯O and N—H⋯N hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C11H9ClN2O2, crystallizes with weak inter­molecular N—H⋯O hydrogen-bond inter­actions. The dihedral angle between the pyrimidine and benzene rings is 86.82 (7)°. [ABSTRACT FROM AUTHOR]