In the title compound, C(24)H(22)N(2)O(6)S, a pyrimidine ring substituted with 4-hy-droxy-3-meth-oxy-phenyl is fused with a thia-zole ring. The 4-hy-droxy-3-meth-oxy-phenyl group is positioned axially to the pyrimidine ring, making a dihedral angle 85.36 (7)°. The pyrimidine ring adopts a twist boat conformation. In the crystal, O-H⋯N inter-actions result in a chain running along the b axis. Th...

The asymmetric unit of the title compound, C(23)H(22)N(2)O(2), contains two independent mol-ecules, A and B. The cyclo-hexane ring of mol-ecule B is disordered, with occupancies for the major and minor conformers of 0.570 (9) and 0.430 (9), respectively. The cyclo-hexane ring adopts a boat conformation in mol-ecule A and in the major conformer of mol-ecule B, and a chair conformation in the min...

In the title compound, C(20)H(20)N(2), the quinoxaline ring adopts a very distorted half-chair conformation [N=C-C=N = 22.7 (2)° for the nominally coplanar atoms] and the cyclo-hexane ring adopts a chair conformation. The quinoxaline and cyclo-hexane rings are cis-fused. The two phenyl rings form a dihedral angle of 63.88 (7)°.

In the title compound, C(18)H(19)Cl(3)O(2), which is the 4-eth-oxy-phenyl analogue of the insecticidally active 4-meth-oxy-phenyl compound meth-oxy-chlor, the dihedral angle between the two benzene rings is 60.38 (13)°. An intra-molecular aromatic C-H⋯Cl inter-action is present.

In the title compound, C(23)H(26)O, the adamantane cage consists of three fused cyclo-hexane rings in classical chair conformations with absolute values of the C-C-C angles in the range 106.57 (11)-111.56 (12)°. The dihedral angle between the two phenyl rings is 81.38 (4)°. Although a hy-droxy group is present as a conceivable donor, no hydrogen bonds are observed in the crystal structure.

The non-coplanar substituted phenyl rings at the 9-position of a fluorenyl unit can be involved in pi-electron delocalization in which the resulting oligofluorenes exhibit a very large enhancement of two-photon absorption cross sections up to 2559 GM at 710 nm.

In the title mol-ecule, C(11)H(12)N(2)O, the pyridazine ring has a skew-boat conformation. The dihedral angle between the phenyl ring [r.m.s deviation = 0.0039 (15) Å] and the best mean-plane of the pyridazine ring [r.m.s deviations = 0.2629 (15) Å] is 53.27 (10)°. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds and C-H⋯π inter-actions involving the methyl group and the phenyl rin...

The seven-membered ring of the title compound, C(18)H(16)N(2)O(3), adopts a boat-shaped conformation (with the C atoms of the fused ring as the stern and the methine C atom as the prow). The substituent at the 3-position occupies an axial position, and the aromatic ring of the substituent is arched over the seven-membered ring in a parasol-like manner, the dihedral angle between the phenyl-ene ...

The title compound, C(15)H(17)N(3), was prepared by reaction of benzoyl-pyridine and hexahydropyrimidine. The 1,3-diazinane ring adopts a chair conformation with one N-H group axial and the other equatorial. The axial N-H group participates in very weak hydrogen bonding to the lone pair of electrons of the N atom with the equatorial H atom producing a very weakly hydrogen-bonded dimer. The pyri...

In the title compound, C(17)H(10)F(6)N(4)O(2)S, an intra-molecular N-H⋯N hydrogen bonds forms an S(5) ring whereas N-H⋯O and C-H⋯S inter-actions complete S(6) ring motifs. The dihedral angle between the fused ring system and the phenyl ring is 6.68 (8)°. In the crystal, the mol-ecules are dimerized due to N-H⋯O inter-actions. π-π inter-actions are present between the benzene rings [centroid-cen...