In the title complex, [Cu(C(12)H(12)N(3)O)(2)], the Cu(II) ion is tetra-coordinated by two N atoms and two O atoms from two bis-chelating 4-(1-imino-eth-yl)-3-methyl-1-phenyl-1H-pyrazol-5-olate ligands in a square-planar geometry. The two N atoms and two O atoms around the Cu(II) atom are trans to each other, as the Cu(II) atom lies on an inversion centre. The six-membered ring composed of the ...

Deoxycitidine in solution exists as two tautomers one of which is an “uncanonical” imino one. The latter can dominate with such derivatives as 5methyl, 5-hydroxymethyland 5-formylcytosine. The imino tautomer potentially is able to form a hoosteen GC base pair. To detect such pair, it is suggested to use 1H15N NMR. Formation of GC-Hoogsteen base pair with imino tautomer of cytosine can be a reas...

The Schiff base, C(20)H(14)BrClN(2)O(2), displays a trans conformation with respect to the C=N double bond. The aromatic rings at either end of the -C(=O)-NH-N=C- fragment are nearly parallel [dihedral angle = 3.4 (5)°]. The hydr-oxy group forms an intra-molecular hydrogen bond to the imino N atom.

In the title compound, [Cu(C(2)H(5)N(4)O(2))(2)(CH(3)OH)(2)]·2C(2)H(6)N(4)O(2)·2CH(3)OH, the Cu(II) atom, lying on an inversion center, is coordinated by four N atoms from two 1,2-diamino-2-hy-droxy-imino-ethanone oximate anion and two O atoms from two methanol mol-ecules in a distorted octa-hedral geometry. The two uncoordinating oxamide dioxime mol-ecules, each lying on an inversion center, a...

The title compound, C(18)H(18)Br(2)N(2), is centrosymmetric with the mid-point of the central C-C bond of the butyl group located on an inversion center. The terminal benzene ring is approximately perpendicular to the central butyl plane [dihedral angle = 71.9 (8)°]. No hydrogen bonding or aromatic stacking is observed in the crystal.

Starting from 2-imino-N-phenyl-2H-chromene-3-carbox-amide, (1) a series of functionalized chromenes were achieved; such as, 2-ethoxy-2,3-dihydro-3-phenylchromeno[2,3-d]pyrimidin-4-one (2), and 2-hydrazinyl-2,3-dihydro-3-phenylchromeno-[2,3-d]pyrimidin-4-one (3). Furthermore, reactions of (3) with some of laboratory available compounds gave pyrazoles (4 9, 12, 13a, 13b), tetrazoles (11), 2-(2-be...