1, 8-dioxo-octahydroxanthene derivatives have efficiently been synthesized from dimedone and aromatic aldehydes using [fe(iii)(salen)cl] complex as an efficient and homogeneous catalyst in molten tetrabutyl ammonium bromide. this methodology offers several advantages, such as good yields, short reaction times, simple procedure, and mild conditions.

A group of biodegradable alanine-derived gemini quaternary ammonium salts (bromides and chlorides) with various alkyl chains and spacer lengths was tested for anti-adhesive and anti-biofilm activity. The strongest antifungal activity was exhibited by bromides with 10 and 12 carbon atoms within hydrophobic chains (N,N'-bis(1-decyloxy-1-oxopronan-2-yl)-N,N,N',N'-tetramethylpropane-1,3-diammonium ...

H. Kleszczyńska3, M. Oświęcimskab, S. Witekb and S. Przestalskia a Department of Physics and Biophysics, Agricultural University, Norwida 25, 50-375 Wroclaw, Poland b Department of Chemistry, Technical University of Wroclaw, Wyb. Wyspiariskiego 27, 50-370 Wroclaw, Poland Z. Naturforsch. 53c, 425-430 (1998); received January 26/March 16, 1998 Antioxidants, Lipid Oxidation, Erythrocyte Ghost, Qua...

The administration of ammonium salts to free ventilated dogs causes an increase in the anaerobic consumption of glucose. Prior and simultaneous administration of the drug ornithine alpha ketoglutarate not only attenuates the rise in blood ammonia but also favourably affects these changes in brain metabolism.

A convenient, one-pot method for the synthesis of diazonium salt has been developed by the sequential diazotization of aromatic amines with NaNO2, polymer- supported periodic acid (PPIA) and 2-naphthole under solvent-free conditions at room temperature. By using this method, several types of aromatic amine, containing electron-withdrawing and electron-donating groups, were rapidly converted to ...

A thermophilic fungus, K1014, newly derived from a compost was selected on the basis of protease productivity as the only one of 81 isolates to produce high levels of acid protease. The fungus was named Penicillium duponti K1014 based on taxonomical studies. It grew in the temperature range of 28 to 58 C, and the optimum was 45 to 50 C. These temperature characteristics showed that the fungus w...

A new approach to capture and store CO(2) by mineral carbonation using recyclable ammonium salts was studied. This process integrates CO(2) capture with mineral carbonation by employing NH(3), NH(4)HSO(4), and NH(4)HCO(3) in the capture, mineral dissolution, and carbonation steps, respectively. NH(4)HSO(4) and NH(3) can then be regenerated by thermal decomposition of (NH(4))(2)SO(4). The use of...

The leaching reaction kinetics of weathered crust elution-deposited rare earth with mixed ammonium salts was studied. The in uence of concentration of reagents and particle size of ore on leaching rate was investigated. The results showed that the di usion process and leaching rate could be improved by increasing reagents concentration and decreasing leaching owing rate and particle size. The l...

Efficient initiation from ammonium trifluoroacetate salts (TFA) dendritic end-groups yields well-defined poly( l -lysine) star polypeptides with 8, 16 and 32 arms. Hydrolytic core degradation plasmid DNA complexation is demonstrated.

The free base of 1,4-dineopentyl-2,5-diphenylpiperazine takes a chair conformation in CDCl3, while the conformation of its diammonium salts changes depending upon the counter anion.