Jabbar Khalafy

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The tautomerism of the synthesized 3-arylpyrimido[4,5-c]pyridazine-5,7(6H,8H)-diones (1a-d) and 3-aryl-7-thioxo-7,8-dihydro-6H-pyrimido[4,5-c]pyridazine-5-ones (2a-d) was studied in dimethyl sulfoxide (DMSO)-d(6). (1)H NMR spectra of 1a-d showed a clustered water molecule in the structure backbone that is attached by strong intermolecular H bonding. The(More)
In the title organometallic polymer, [HgCl(2)(C(26)H(20)NO(3)P)](n), the monodentate 1-(3-nitro-phen-yl)-2-(triphenyl-phospho-ran-yl--idene)ethanone ligand is coordinated to the Hg(II) atom through the methine C atom. The Hg(II) atom is four-coordinated in a distorted tetra-hedral geometry by one terminal Cl atom, two bridging Cl atoms, and one C atom from(More)
The NMR spectra of azo dyes, 5-arylazobarbituric (5a-g), 5-arylazo-1,3-dimethylbarbituric (6a-g) and 5-arylazothiobarbituric acids (7a-g) were studied in DMSO-d6 in different concentrations. An intramolecular hydrogen bond was observed and indicating that the hydrazone forms is mostly predominant. The peak of the hydrazone proton was severely broadened and(More)
1. GABA(B) autoreceptors are a subclass of GABA(B) receptors that inhibit the release of [(3) H]GABA from GABAergic nerve terminals. Baclofen is an agonist that reduces [(3)H]GABA, whilst the antagonist (+)-(S)-5,5-dimethylmorpholinyl-2-acetic acid (Sch 50911) enhances [(3)H]GABA release in electrically-stimulated rat neocortical brain slices preloaded with(More)
The reaction of isoxazol-5(2H)-ones, unsubstituted at C-3, with base is well known and the various intermediates have been trapped to prepare a large number of hetrocyclic system. However, the reaction of 3-substituted compounds with base is not so well known, and the only reported reactions appear to be that described by Doleschall, who alkylated the anion(More)
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