A kinetic investigation into the origin of enantioselectivity for the Pd[(-)-sparteine]Cl(2)-catalyzed aerobic oxidative kinetic resolution (OKR) is reported. A mechanism to account for a newly discovered chloride dissociation from Pd[(-)-sparteine]Cl(2) prior to alcohol binding is proposed. The mechanism includes (1) chloride dissociation from Pd[(-)-sparteine]Cl(2) to form cationic Pd(-)-spar...

We synthesized a series of modified Co-ZIF-67 materials with tunable morphology to support fine Au nanoparticles for the alkali-free aerobic oxidation benzyl alcohol. Structure promotion was performed using Stöber silica as hard template, which subsequently removed by NaOH etching before gold immobilization. The texture structure Au/(Si)C greatly improved increasing surface area and volume. CoO...

a series of transition metal complexes with two thiosemicarbazide schiff bases, 1-(4-dimethylaminobenzyl- idene)thiosemicarbazide (abtsc) and 1-(2-pyridincarboxyl-idene) thiosemicarbazide (tcts) were synthesized with co(ii), ni(ii), zn(ii), cd(ii) and ag(i) salts (chloride and acetate). these complexes were characterized by different methods including proton nuclear magnetic resonance (1hnmr), ...

In the present study we have analyzed protein oxidation on Escherichia coli when these cells were submitted to different stress conditions such as hydrogen peroxide, superoxide-generating compounds, and iron overloading. Carbonyl groups on oxidized cell proteins were examined by Western blot immunoassay. When anaerobically grown E. coli cells were exposed to hydrogen peroxide stress, alcohol de...