Guang-Chuan Ou

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The title compound, C(30)H(50)O(3), which was isolated from a marine endophytic fungus, is a new friedelan derivative. The mol-ecule contains five six-membered rings, which exhibit boat (ring A), distorted boat (ring B) and chair (rings C-E) conformations. The crystal structure is stabilized by inter-molecular O-H⋯O hydrogen bonds, which link neighbouring(More)
In the title salt, [Ni(C(7)H(6)NO(2))(C(16)H(36)N(4))]ClO(4)·H(2)O, the Ni(II) cation is O,O'-chelated by the benzoate anion and N,N',N'',N'''-chelated by the macrocycle ligand, confering a distorted octa-hedral geometry on the metal atom. The complex cations, perchlorate anions and uncoordinated water mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds(More)
The Ni atom in the title salt, [Ni(C(7)H(5)O(2))(C(16)H(36)N(4))]ClO(4)·H(2)O, is in a six-coordinate octa-hedral geometry. The metal atom is chelated by the carboxyl-ate group, and the macrocyclic ligand adopts a folded configuration. The cation, anion and water mol-ecules engage in hydrogen bonding to form a layer structure.
In the title salt, [NaZn(2)(CH(3)COO)(2)(ClO(4))(2)(C(16)H(36)N(4))(2)]ClO(4), the macrocyclic ligand binds to the Zn(2+) cations through their four amino N atoms; the Zn(2+) cations are also each covalently bonded to an acetate ion. For one zinc atom, the acetate group is monodentate, and the geometry is a distorted ZnN(4)O trigonal bipyramid; for the(More)
Both mol-ecules of the title compound, [Ni(C(2)O(4))(C(16)H(36)N(4))]·C(2)H(2)O(4), are located on a crystallographic twofold rotation axis. The Ni(II) atom shows a distorted octa-hedral geometry. The crystal packing is stabilized by N-H⋯O and O-H⋯O hydrogen bonds.
The enantiopure agents d- and l-leucine, selectively bind RR and SS enantiomers from a racemate [Ni(alpha-rac-L)](2+) to give {[Ni(RR-L)(d-HLeu)](ClO(4))(2)}(n) (Delta-) and {[Ni(SS-L)(l-HLeu)](ClO(4))(2)}(n) (Lambda-), respectively, and leave the corresponding uninteracted SS and RR enantiomers of [Ni(alpha-SS-L)](ClO(4))(2) (S-) and(More)
The title compound, [Ni(C(8)H(5)O(4))(C(16)H(36)N(4))]ClO(4)·H(2)O, has the Ni(II) atom in a distorted octa-hedral geometry, surrounded by coordination by four N atoms of the 5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-azacyclo-tetra-decane ligand in a folded configuration, and two carboxyl-ate O atoms of the 2-carboxy-benzoate ligand in cis positions. The(More)
A series of novel 2,3- or 2,5-dispirooxindole-piperazine ring systems were efficiently constructed through the acid-promoted self-1,3-dipolar [3+3] cyclizations of azomethine ylides derived from isatin with various primary or cyclic secondary amines. Interestingly, the regioselectivity of this self-[3+3] cyclization could be effectively tuned by varying the(More)
In the title compound, [Ag(2)(C(6)H(6)NO(3)S)(2)(C(10)H(8)N(2))(2)](n), the Ag(I) atom is four-coordinated by two N atoms from two symmetry-related 4,4'-bipyridine (bipy) and two O atoms from two independent 4-amino-benzene-sulfonate (ABS) ligands. The two inter-chain Ag(I) atoms are bridged by two independent ABS ligands through weak Ag-O bonds and Ag⋯Ag(More)