The title mol-ecule, C(21)H(26)O(3), has a six-membered planar carbon ring as the central core, substituted at position 1 with phen-oxy-carbonyl, at position 2 with hy-droxy and at positions 3 and 5 with tert-butyl groups. The structure shows two independent but very similar mol-ecules within the asymmetric unit. For both independent mol-ecules, the ester carboxyl-ate group is coplanar with the...

The Co atom in the title complex, [Co(CH(3)CHCHCOO)(2)(C(10)H(9)N(3))(H(2)O)], has a distorted recta-ngular-pyramidal geometry formed by the chelating dipyridylamine ligand, and two O atoms of monodentate carboxyl-ate groups of two different crotonate anions and a water molecule. The complex forms a three-dimensional supra-molecular network via inter-molecular O-H⋯O, N-H⋯O and C-H⋯O hydrogen-bo...

The 3-compact group DI(2) is characterized by cohomology algebra with coefficients in the finite field F3, H∗(BDI(2); F3) = F3[x12, x16], being the rank 2 Dickson algebra. We show that DI(2) is a totally N-determined 3-compact group, compute the endomorphism monoid of DI(2), and investigate subgroups of DI(2).

The crystal structure of the title compound, C(17)H(24)N(2)O(5), was determined in the course of our studies on the preparation of two families of pseudopeptides, viz. hydrazino- and N-amino- peptides. The most significant inter-action in the crystal structure is a bifurcated inter-molecular N-H⋯O hydrogen bond.

In the title compound, C(12)H(10)N(2)S(2), which was synthesized by the reaction of 2,2'-thenil and ethyl-enediamine, the dihedral angle between the two thio-phene rings is 66.33 (9)°. In the crystal structure, inter-molecular C-H⋯N hydrogen bonds link the mol-ecules into infinite chains along the b axis and weak C-H⋯π inter-actions may further stabilize the structure.

The title complex, [Cu(SO(4))(C(10)H(9)N(3))(CH(3)OH)], is a mononuclear species with the Cu(II) ion in a Jahn-Teller-distorted '4 + 1' square-pyramidal geometry. The basal plane is defined by the pyridyl N-atom donors of the bipyridyl-amine (bpa) ligand and two O-atom donors of the sulfate ligand. The coordination geometry is completed by the axial coordination of a methanol O-atom donor. The ...

In the title compound, C(19)H(14)N(4), which was crystallized from dimethyl sulfoxide, the arene and heterocyclic rings of the lophine analogue framework differ only slightly from coplanarity (dihedral angles range from 8.8 to 20.2°), and intramolecular N-H⋯N and C-H⋯N interactions help to establish the conformation. The crystal packing features a number of weak C-H⋯N, N-H⋯N hydrogen-bond type ...

The asymmetric unit of the title compound, C(22)H(26)N(2)O, contains three crystallographically independent mol-ecules, in which the aromatic rings are oriented at dihedral angles of 21.74 (5), 27.59 (5) and 27.87 (5)°. Intra-molecular O-H⋯N hydrogen bonds result in the formation of planar six-membered rings, and these are nearly coplanar with the adjacent rings. In the crystal structure, π-π c...

In the title compound, C(21)H(28)N(2)O, the dihedral angle between the rings is 35.2 (2)°. A weak intra-molecular O-H⋯N hydrogen bond is observed between the O-H H atom and the imine N atom. In the crystal, mol-ecules are linked by additional inter-molecular N-H⋯O hydrogen bonding, resulting in a wave-like chain along the b-axis direction.