Spectroscopic Study of some Schiff Bases Derived from Dibenzoylmethane

A series of Schiff bases 7-11 derived from dibenzoylmethane have been prepared. The UV, IR, 1H NMR and mass spectra revealed theses compounds were existed mainly as the keto-enamine tautomer in the solution. The absorption bands which appeared in the range λmax = 376-406 nm were assigned to the electronic transitions which arised from the central hydrogen bonded chelated unsaturated ring system in this tautomer. The appearance of the broad singlet near d  = 13 ppm due to the N-H proton and a singlet near d  = 6 ppm due to the –C=C-H proton inaddition to benzoyl fragment ion     signal m/z =105 in the mass spectra supported the above suggested products

Reaction of Potassium Tellurocyanate with 2-Chloroethanol

Reaction of 2-chloroethanol with potassium tellurocyanate gave a new heterocycle namely 1,3-oxatellura-2-imine 1  in a good yield.  Halogenation of organotelluride 1  with SOCl2, bromine and iodine gave dichloro, dibromo and diiodo organic tellurium compounds, Treatment of 1 with alkyl halides gave new organic tellurium compounds.  Hydrolysis of 1 afforded a new cyclic telluride. All the new synthesized compounds were characterized by elemental analysis (CHN), IR, 1H and 13C NMR  spectr

Theoretical study on the electronic spectra in cyclic 1,2-diketones

AbstractThe structural and electronic properties of some α-diketones have been investigated theoretically by performing both Hartree–Fock and density functional theory calculations at HF/6-31G(d,p) and B3LYP/6-31G(d,p) levels of theory.The electronic spectra were calculated by ZINDO and TD methods at each level of theory. The wavelength of the n→π∗ electronic transitions was correlated with the torsion angle between the two carbonyl groups in these compounds. The study revealed that the n→π∗ electronic transitions in the studied compounds are functions of the torsion angles between the two carbonyl groups within the linkage CO–CO

Synthesis, Characterization and Antitumor Activity of Some New Oganotellurium Compounds Containing Azomethine Group, Part One

New tellurated schiff bases were synthesized by the reaction of the corresponding mercurated Schiff  bases compounds A1-A3 with tellurium tetrabromide in 1:1 mole ratio and  that  gave organyltellurium tribromides  A4-A6.  On the other hand, when mercurated schiff bases and tellurium tetrabromide brought  together in 2:1 mole ratio gave diorganyltellurium dibromides compounds A10-A12 followed by reduction with hydrazine hydrate gave new diorganyl tellurides A13-A15.  Reduction of compounds A4-A6 by  hydrazine hydrate gave new ditellurides A7-A9.  All compounds were characterized by elemental analysis, IR, 1H , 13C NMR, HSQC-NMR and mass spectra.  Invitro anti-tumor bioactivity of some compounds were tested.Â

Synthesis, X-ray structure, <i>in vitro</i> HIV and kinesin Eg5 inhibition activities of new arene ruthenium complexes of pyrimidine analogs

<p>Three new ruthenium(II)-arene complexes of the general formula [{(η⁶-<i>p</i>-cymene)Ru(L)}₂](Cl)₂), where L are monastrol (<b>L</b>^<b>1</b>), ethyl 4-(3-hydroxyphenyl)-6-methyl-2-thioxo-pyrimidine-5-carboxylate (<b>L</b>^<b>2</b>) or its 4-bromophenyl analog (<b>L</b>^<b>3</b>), have been synthesized and characterized by elemental analysis, ¹H, ¹³C, and 2-D NMR spectroscopy. The X-ray diffraction study of complex <b>1</b> showed the presence of a dicationic diruthenium complex where two thioxopyrimidines act as tridentate <i>μ,κN:κ</i>^<i>2</i><i>S</i> ligand, bridging two Ru ions through the pyrimidine nitrogen and sulfur atoms. All new complexes were evaluated <i>in vitro</i> for their antiviral activity against the replication of HIV-1 and HIV-2 in MT-4 cells using MTT assay. Additionally, complexes <b>1</b>–<b>3</b> were screened for their inhibitory activity against the ATPase enzyme and the motor-protein Kinesin Eg5. Complex <b>1</b> was found to inhibit microtubule-stimulated ATPase activity of kinesin of IC₅₀ = 30 μM (monastrol, IC₅₀ = 10 μM).</p