Determination of chromium(VI) in electronics materials using trioctylamine modified carbon paste electrode.

A trioctylamine (TOA) modified carbon paste electrode (TOA/CPE) was firstly utilized to determine Cr(VI) in electronics materials. The effects of preconcentration conditions, that is, TOA amount and accumulation time on Cr(VI) accumulation were examined and the optimum experiment conditions for the determination were identified. A sensitive reduction peak in the stripping voltammogram at -0.

Michael addition of pyrimidine with disaccharide acrylates catalyzed in organic medium with lipase M from Mucor javanicus.

The Michael addition of fluorouracil (0.01 mol), uracil (0.01 mol), thymine (0.

A single-enzyme, two-step, one-pot synthesis of N-substituted imidazole derivatives containing a glucose branch via combined acylation/Michael addition reaction.

Combined regioselective acylation/Michael addition reaction catalyzed by alkaline protease from Bacillus subtilis in anhydrous pyridine for synthesis of N-substituted imidazole derivatives containing a glucose branch via a novel single-enzyme, two-step, one-pot procedure is reported.

Michael addition of imidazole with acrylates catalyzed by alkaline protease from Bacillus subtilis in organic media.

A new activity of alkaline protease from Bacillus subtilis for Michael addition reactions of imidazole, 4-nitro-1H-imidazole and 2-methyl-4-nitro-1H-imidazole with acrylates and acrylic acid was investigated. The reactions were carried out in pyridine at 50 degrees C for 72 h. Five N-substituted imidazole derivatives were obtained using acrylate esters, but not acrylic acid, in yields from 62% to 76%.