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In the title compound C(22)H(24)O(2), the exocyclic C=C double bond is in an E configuration and the tert-butyl group is in an axial position on the cyclo-hexa-none ring. The cyclo-hexa-none ring in the dihydro-naphthalene fused-ring system adopts a half-chair conformation in both independent two mol-ecules in the asymetric unit. The benzene ring system is oriented angles of 43.97 (12) and 39.24 (12)° with respect to the naphthyl ring system in the two independent mol-ecules. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds and C-H⋯π inter-actions.

In the title compound, C(30)H(31)NO(3), the tolyl ring is almost coplanar with the isoxazole ring [dihedral angle = 12.51 (7)°], whereas the meth-oxy-phenyl ring is almost perpendicular to the isoxazole ring [dihedral angle = 89.77 (5)°]. In the crystal, mol-ecules are connected through C-H⋯O hydrogen bonds, forming chains running along the a axis.

The asymmetric unit of the title polymer, {[Na(4)(C(15)H(14)N(2)O(4))(2)]·7.5H(2)O}(n), contains two 2-[(3,5-dimethyl-1H-pyrazol-1-yl)(phen-yl)meth-yl]propane-dioate (ppmp) anions, eight water mol-ecules (one located on a twofold rotation axis) and five sodium cations (one located on an inversion center and the other one located on a twofold rotation axis). The carboxyl-ate groups of the ppmp anions and the water mol-ecules bridge the Na cations, forming a two-dimensional polymeric structure. In the structure there are two types of coordination environment around the metal cations: one Na cation is coordinated by five O atoms in a distorted square-pyramidal geometry while the other four Na cations are coordinated by six O atoms in a distorted octa-hedral geometry. Extensive O-H⋯O and O-H⋯N hydrogen bonding is present in the crystal structure. The H atoms of one methyl group of the ppmp anion are disordered equally over two positions.

The title compound, C(20)H(26)N(2)O(5), was prepared in good yield (76%) through condensation of diethyl (4-meth-oxy-benz-yl)propane-dioate with 3,5-dimethyl-1H-pyrazole. The dihedral between the benzene and pyrazole rings is 83.96 (10)°. The crystal packing is stabilized by a C-H⋯O inter-action, which links the mol-ecules into centrosymmetric dimers.

There are two independent mol-ecules in the asymmetric unit of the title compound, C(17)H(20)N(2)O(4), which differ slightly in the orientation of the phenyl ring and carbonyl groups with respect to the pyrazole unit. In the first mol-ecule, the dihedral angle between the phenyl and pyrazole rings is 68.99 (13)° while the two carbonyl groups make a dihedral angle of 72.1 (4)°. The corresponding values in the second mol-ecule are 68.54 (14) and 71.5 (4)°, respectively.

The asymmetric unit of the title compound, C(29)H(30)F(3)NO(4), contains two independent mol-ecules. In each independent mol-ecule, one of two terminal ethyl groups is disordered over two conformations: the occupancies of major components were fixed at 0.53 and 0.64 in the two mol-ecules. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds link mol-ecules into chains propagating along [10].

In the title compound, C(22)H(27)NO(4), the mean planes of the two benzene rings form a dihedral angle of 73.54 (13)°. One of the methyl groups is disordered over two sites, with site occupation factors of 0.47 (15) and 0.53 (15). The crystal packing is controlled by van der Waals forces and a possible C-H⋯O inter-action, forming a chain running parallel to the a axis.

The title compound, C(14)H(8)N(4)O(6), a new 1,2,5-oxadiazole N-oxide derivative, was formed by dimerization of 4-nitro-benz-al-de-hyde oxime. The compound crystallizes with two independent mol-ecules per asymmetric unit. The N-oxide O atom is disordered over two sites in each mol-ecule; site occupancy factors are 0.57/0.43 and 0.5/0.5. The mean planes through the two benzene rings are inclined to the planar 1,2,3-oxadiazole ring by 25.03 (11) and 41.64 (11)° in one mol-ecule, and 22.58 (11) and 42.66 (11)° in the other mol-ecule, the smaller angle being for the ring on the oxide side of the oxadiazole ring in each case. In the crystal structure, the individual mol-ecules form centrosymmetric dimers linked via C-H⋯O hydrogen bonds. The dimers of one mol-ecule are then linked to those of the other mol-ecule via C-H⋯O hydrogen bonds, forming a three-dimensional network.