We report the synthesis and biological in vitro activities of 16 new 2-quinoxalinecarbonitrile 1,4-di-N-oxides. These compounds present new basic lateral chains (piperazines and anilines) in the 3 position as well as different substituents in the 6 and/or 7 positions of the quinoxaline ring. Amo...

Flash vacuum thermolysis reactions of N-(tert-butyl)-N-(pyrimidin-2-ylmethylidene)amine (1), N-(tert-butyl)-N-(pyrazin-2-ylmethylidene)amine (2), N-(tert-butyl)-N-(quinolin-2-ylmethylidene)amine (3), N-(tert-butyl)-N-(quinoxalin-2-ylmethylene)amine (4) and N-(tert-butyl)-N-(isoquinolin-2-ylmethy...

A novel series of acridine linked to thioacetamides 9a–o were synthesized and evaluated for their α-glucosidase inhibitory and cytotoxic activities. All the synthesized compounds exhibited excellent α-glucosidase inhibitory activity in the range of IC50 = 80.0 ± 2.0–383.1 ± 2.0 µM against...

A silver-catalyzed highly efficient and regioselective synthesis of ketones from a wide range of alkynes is described. The reaction is dramatically accelerated by its performance in aqueous emulsion, which is self-assembled by the addition of silver perfluorooctanesulfonate (1) and perfluoroocta...

A general, efficient and highly regioselective protocol using an indium(III) trifluoromethanesulfonate and PTSA (TsOH·H2O) catalytic system for the transformation of various alkynes to the corresponding ketones has been successfully developed.

Matrix metalloproteinase-13 (MMP-13), a member of the collagenase family of enzymes, has been implicated to play a key role in the pathology of osteoarthritis. Recently, we have reported the discovery of a series of quinazoline-2-carboxamide based non-zinc-binding MMP-13 selective inhibitors, as...

Four imidazolium perrhenates were synthesized, characterized and used as efficient catalysts for the oxidative esterification of benzaldehydes with alcohols. The perrhenates showed high catalytic activity toward oxidative esterifications, whereas good yields could be obtained for a series of ald...

Counterions have a significant effect on the efficiency of the deoxydehydration (DODH) reaction. Four perrhenate salts, Z+ReO4− (Z = Na+, K+, NH4+, and Bu4N+), were tested in the DODH reaction of a vicinal diol in the presence of PPh3 as the reductant. In addition, a new perrhenate salt, (2-ppyH...

Nitroxyl (HNO) is one of the important derivatives of nitric oxide (NO). It was intertwined with various biological and pharmacological events as a well-defined active molecule. Developing fluorescent probes for high specific and in situ trapping of HNO in living samples is still challenging. In...

The kinetics for the reactions of hypoiodous acid (HOI) with various phenols (phenol, 4-nitrophenol, 4-hydroxybenzoic acid), 3-oxopentanedioic acid (3-OPA) and flavone were investigated in the pH range of 6.0–11.0. The apparent second order rate constants for the reactions of HOI with phenolic ...

Toxic and odorous iodinated disinfection byproducts (I-DBPs) could form in the chemical oxidation of iodine-containing water. A critical step for controlling the hazardous I-DBPs is to convert the iodine species into stable and harmless iodate (IO3−) while inhibiting the accumulation of highly r...

Tunable monochromatic photon radiation was used to measure transmission of a bismuth target in the energy range from 7 keV to 20 keV. Partial L fluorescence yields of bismuth were obtained by combining measurement of the fluorescence induced by photoionization of the bismuth target and X-rays fr...

A rapid method for the determination of polonium-210 in urban matrices has been developed that can be used following a radiological event. Samples such as concrete, soil and granite are fused with sodium hydroxide to minimize polonium volatility during sample digestion and to achieve complete sa...

This communication reports the development of an analytical method for the measurement of low-levels of lead-210 in natural waters via measurement of the beta activity of its in-grown bismuth-210 daughter. The analysis essentially consists of three stages. (a) Pre-concentration of the lead-210 i...

Due to the nature of Cerenkov radiation and instrumental limitations, detection efficiencies of 210Bi by Cerenkov counting are generally quite low (~15%). Sodium salicylate, acting as a wavelength shifter, has been used to improve the detection efficiency of Cerenkov photons. In this study, we f...

The new complex [Cu2(H2L)Cl3] with axial chloride ions coordination based on 4-methyl-2,6-bis{[2-(4,6-dimethyl-pyrimidin-2-yl)hydrazono]methyl}phenol was obtained and its crystal structure was determined. Magnetic studies revealed the presence of antiferromagnetic exchange interaction of −193 cm...

1,2-Bis(trimethylsiloxy)cyclobutenes undergo facile autoxidative ring contraction yielding 1-trimethylsiloxycyclopropane carboxylic acid trimethylsilyl esters as major products. The results are discussed in terms of a mechanism involving electron transfer and intermediate formation of dioxiranes.

The interaction of tris(trimethylsilyl) phosphite (TMSO)3P and E-trifluoromethyl-β-alkoxyenones CF3C(O)CHCHOEt and CF3C(O)CHC(OMe)Me yielded mixtures of E-1,2- and Z-1,4-adducts, CF3C(OTMS)[P(O)(OTMS)2]CCH(OAlk)R 2 and CF3(OTMS)CCHCR(OAlk)[P(O)(OTMS)2] 3 where R and Alk = H and Me, or both Me. ...

Lithium-rich layered metal oxide electrode materials suffer from severe capacity fading and poor rate performance in lithium-ion batteries. Herein, we demonstrate that trimethylsilyl (trimethylsiloxy) acetate (bis-TMSA) can be used as a novel electrolyte additive to improve the electrochemical p...

The new functionalized aminomethylenediphosphonates with moieties of various amino acids are synthesized via unique reaction of tris(trimethylsilyl) phosphite and N-formyl amino acids at the presence of effective catalyst – trimethylsilyl triflate under mild conditions. The further treatment of...