A straightforward gram-scale synthesis of 1,3,5,7-tetrakis(methylidene)cyclooctane (TMCO) from commercial adamantane-1,3-dicarboxylic acid has been developed. TMCO exhibits high reactivity toward a number of carbenes and epoxidizing reagents, undergoing multiple cyclopropanations, dihalocyclopropanations, or epoxidations of four double bonds to yield… (More)
The title compound, [Ni(C4H5N4O2)2(H2O)2]·2H2O, represents the first transition metal complex of the novel chelating triazole ligand, 2-(5-amino-1H-1,2,4-triazol-3-yl)acetic acid (ATAA), to be structurally characterized. In the mol-ecule of the title complex, the nickel(II) cation is located on an inversion centre and is coordinated by two water mol-ecules… (More)
In the title salt, C15H16NO4(+.)Br3(-), classical intra-molecular O-H⋯O hydrogen bonds are found, which results in the co-planarity of the ester substituents with the quinolinium residue [C-C-C-O torsion angle = 1.0 (10)°]. The bromine anions are placed on both sides of heterocyclic cation and form Br⋯N contacts of 3.674 (9) and 3.860 (9) Å, which confirms… (More)
Novel three-component heterocyclization involving gem-bromofluorocyclopropanes, nitrosyl tetrafluoroborate, and a molecule of the solvent (nitrile) yielding previously unknown fluorinated pyrimidine N-oxides is described. A two-step synthetic approach to 4-fluoropyrimidine N-oxides from alkenes under mild conditions is developed using this reaction.… (More)
The title chiral compound, C(23)H(28)NO(+)·Br(-), was obtained from an optically active amino-ethanol precursor. The pyrrolidine heterocycle has an envelope conformation, with the C atom α-positioned with respect to the keto group deviating by 0.570 (6) Å from the mean plane of other atoms. The trans-fused seven-membered ring adopts a pseudo-chair… (More)
In the cation of the title compound, C(7)H(8)N(5) (+)·Cl(-)·H(2)O, the mean planes of the pyridine and 1,2,4-triazole rings form a dihedral angle of 2.3 (1)°. The N atom of the amino group adopts a trigonal-pyramidal configuration. The N atom of the pyridine ring is protonated, forming a chloride salt. In the crystal, inter-molecular N-H⋯O, N-H⋯N, N-H⋯Cl… (More)
The asymmetric unit of the title compound, C(14)H(13)O(2)PS(2), contains two crystallographically independent mol-ecules, which differ in the conformation of the 1,3,2-benzoxathia-phosphinine moieties (screw boat in the first mol-ecule and envelope in the second mol-ecule). In the crystal, neither classical nor non-classical hydrogen bonds are found. Weak… (More)
In the title mol-ecule, C(14)H(15)NO(3), the six-membered heterocyclic ring exhibits an envelope conformation. In the crystal, C-H⋯π inter-actions link the mol-ecules into centrosymmetric dimers, and weak inter-molecular C-H⋯O hydrogen bonds link these dimers into columns propagated along .
In the title complex, [Cu(H(2)NCH(2)CH(2)NH(2))(3)](CF(3)COO)(2), the environment of the Cu atom is distorted octa-hedral, formed by six N atoms from three chelating ethane-1,2-diamine ligands. The Cu-N distances range from 2.050 (2) to 2.300 (2) Å. This complex cation and the two trifluoro-acetate anions are connected by weak N-H⋯O and N-H⋯F hydrogen… (More)
The title compound, C(13)H(12)BrNO(4), was obtained from an optically active aniline derivative. The structure was characterized by (1)H NMR, (13)C NMR, MS and X-ray diffraction techniques. 86% of the atoms of the two independent mol-ecules in the asymmetric unit show non-crystallographic inversion symmetry.