This review covers twenty four Pt(II) complexes of the inner coordination sphere Pt(κ3–P1 N1N2)(Y), (Y = Cl, CL); Pt(κ3–P1N1X1)(Y), (X1 O1 and Y P2L, I); C1 NL, Cl); S1 Se1 Pt(κ3–N1P1N2)(Cl), Pt(κ3–S1P1S2)(Cl), Pt(κ3–P1S1Cl1)(Cl) Pt(κ3–P1Si1N1)(OL). These are crystallized in three crystal classes: monoclinic (16 examples), triclinic (5 orthorhombic (3 examples). Each κ3–ligand creates two metal...

The title compound, C(16)H(24)Cl(2)O, was synthesized from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzocyclo-heptene), which was isolated from the essential oil of the Atlas cedar (cedrus atlantica). The mol-ecule forms an extended sheet of two fused rings which exhibit different conformations. The six-membered ring has a half-chair conformation, while the seven-membered...

The title compound, C(34)H(54)Br(2)N(2)O(6), was obtained by the Michael addition-elimination reaction of (5S)-5-(l-menthyl-oxy)-3,4-dibromo-furan-2(5H)-one with 1,6-hexa-nediamine in the presence of triethyl-amine. The crystal structure contains two chiral five-membered furan-one rings, in twist and envelope conformations, and two six-membered cyclo-hexane rings in chair conformations.

The mol-ecule of the title compound, C(26)H(34)O(8), a prednisolone derivative, contains three six-membered rings (A, B and C) and one five-membered ring (D). Ring A is planar and rings B and C adopt chair conformations, while ring D adopts an envelope conformation with the C atom bonded to the methyl group at the flap. The crystal structure is stabilized by intermolecular O-H⋯O hydrogen bonds.

In title compound, C(7)H(8)N(2)S, the five-membered rings are twisted by a dihedral angle of 5.17 (10)°. Two inter-molecular N-H⋯N and C-H⋯N hydrogen bonds to the same acceptor N atom form seven-membered rings, producing R(2) (1)(7) ring motifs. These inter-actions link neighbouring mol-ecules into one-dimensional chains extended along the c axis. The crystal structure is further stabilized by ...

The title compound, C(18)H(19)N(3)O(3), is a biologically active triazole derivative. The five-membered ring is oriented with respect to the six-membered rings at dihedral angles of 51.59 (4) and 61.37 (4)°. The crystal structure is stabilized by inter-molecular N-H⋯O hydrogen-bond inter-actions between centrosymmetrically related mol-ecules [the dihedral angle between the benzene rings is 47.4...

The title compound, C(11)H(13)N(2)O, was obtained by cyclo-condensation of 2-amino-pyridine-3-carbonitrile with cyclo-penta-none. The mol-ecule is built up from two fused six-membered rings and one five-membered ring linked through a spiro C atom. Both the pyrimidine and the cyclo-pentane rings adopt envelope conformations. In the crystal structure, mol-ecules are linked by inter-molecular N-H⋯...

The title compound, digoxigenone, C(23)H(30)O(5)·H(2)O, was biotransformed from digoxigenin. In the crystal, inter-molecular O-H⋯O hydrogen bonds contribute to the formation of a three-dimensional supra-molecular structure. The title compound has three fused six-membered rings (A,B,C) and two non-fused five-membered rings (D,E). As in other structures, compound nucleus has a cis-trans-cis confo...

The asymmetric unit of the title solvate, C21H22N2O2·CH3OH, contains one methanol solvent mol-ecule and one mol-ecule of the heterocycle that is built up by the fusion of four six-membered rings A, C, D, E and one five-membered ring B. The indole moiety (rings A and B) is essentially planar, with an r.m.s. deviation of 0.013 Å, whereas rings C and D adopt a twisted conformation with a trans-rin...

The title compound, C(21)H(30)O(6), a natural ent-kaurane diterpenoid, was obtained from the medicinal plant Isodon serra. The five rings in the mol-ecule exhibit the expected cis and trans junctions. The three six-membered rings adopt chair, twist-boat and boat conformations, while two five-membered rings adopt envelope conformations. There are two mol-ecules in the asymmetric unit, related by...