effects of imidazoles and substituted pyridines and pure s-donors on the oxidation of cyclooctene with naio4 by 5,10,15,20-tetraphenylporphyrinato-manganese(iii) acetate, mn(tpp)oac, and 5,10,15,20-tetramesitylporphyrinato-manganese(iii) acetate, mn(tmp)oac, catalysts in ch2cl2-h2o solvent are studied. coordination of the nitrogen donors to the mn-catalysts generally caused a reduction in the e...

Tosylates and mesylates were directly converted into the corresponding nitroalkanes, by their treatment with tetrabutylammonium nitrite (TBAN) under mild conditions.

A new periodate-based reactive assay system enables the rapid evaluation of cis-dihydroxylation activity Rieske dioxygenase enzymes.

In studies of manganese deficiency in the rabbit,1 a method for the determination of this element in small samples of blood serum and other tissues was needed. The most promising of the organic reagents suitable for manganese appeared to be 4,4’-tetramethyldiaminodiphenylmethane, which has been used by Harry (1) in a calorimetric procedure and by Mellan (2) as a spot test reagent. Preliminary t...

UDP-GlcNAc (UDP-N-acetylglucosamine) and UDP-GlcA (UDP-glucuronic acid) were oxidized by periodate in the ribose ring and utilized as inhibitors for hyaluronate synthase in membrane fractions from the B6 cell line and in cell cultures of B6 cells and human fibrosarcoma HT 1080. Inhibition was irreversible and concentration-dependent and could be prevented in the case of periodate-oxidized UDP-G...

A rapid, simple, precise and accurate method is proposed for the determination of ternary mixtures of periodate-iodate-bromate based on their reaction with iodide ion at different pH values. The absorbance was measured at 352 nm. Three sets of reaction conditions were developed. In the first set of conditions, only periodate reacted with iodide, but in the second set the periodate and iodate re...

Water-soluble sulfonated cellulose (SC) samples were synthesized by oxidizing hardwood kraft pulp with sodium periodate followed by the sulfonation reaction with sodium bisulfite. Six levels of oxidation/sulfonation were obtained by using different mmols (0.93-4.67) of periodate per gram of pulp. The aldehyde and sulfonic acid contents, surface morphology, and water solubility property of these...

The molecular mechanism of action of the antitumor drug, methylthioinosine periodate oxidation product, was demon strated. This periodate oxidation product (methylthioinosinedicarboxaldehyde) inhibited bovine pancreatic ribonuclease A. The inhibition was due to Schiffs base formation with e-amino groups of lysine residues, one of which was in close proximity to the catalytic center of the enzyme.

The recoveries of picloram, picloram-methylester, hexazinone, benzene, and acetophenone from aqueous samples were studied using a commercially available hydrocarbonaceous pre—analysis extraction cartridge, both with and without tetrabutylammonium hydrogen sulfate (TBAHS) in the eluent. Extraction efficiency was found to be dependent on sample loading volume. The results suggest a mixed mechanis...