Synthesis of low polydispersity,controlled-structure sugar methacrylate polymers under mild conditions without protecting group chemistry

We report the synthesis of low polydispersity, controlled-structure sugar methacrylate polymers by the ring-opening reaction of 2-aminoethyl methacrylate with D-gluconolactone, followed by the atom transfer radical polymerisation of the resulting sugar methacrylate in methanol at 20 degrees C.     

Enzyme-catalysed oxygenation and deoxygenation routes to chiral thiosulfinates

Enantioenriched thiosulfinates have been obtained by dioxygenase- and chloroperoxidase-catalysed oxidation of 1,2-disulfides and dimethyl sulfoxide reductase-catalysed deoxygenation.     

Separation and identification of alkaloids by Paper electrophoresis and its application in medico-legal cases

Summary Separation of toxicologically important alkaloids by paper electrophoresis in two buffer systems is described. The fluorescence observed under ultraviolet light, the colour of the spots with different spraying reagents, and the migration distance of alkaloids are recorded. The application of the technique in medico-legal autopsy analysis is stressed.

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Zusammenfassung Die papierelektrophoretische Trennung toxikologisch bedeutsamer Alkaloide in zwei Puffersystemen wurde beschrieben. Die Fluoreszenz im UV-Licht, die Farbreaktion der Flecken mit verschiedenen Sprühreagenzien und die Wanderungsstrecke der Alkaloide werden ermittelt. Die Anwendung des Verfahrens in der forensisch-chemischen Analyse wird empfohlen.

     

Rate enhancing effect of bromide on the removal of ammonia at Ti/PbO2 anode

Electrochemical oxidation of ammonium (NH4+) at Ti/PbO2 anode in chloride-free and chloride containing aqueous solutions was studied. The experimental results have shown that oxidation of NH4- is ensured only in the presence of chloride. The oxidation of NH4+ is found to follow pseudo first-order kinetics. Bromide in the electrolyte is found to cause substantial rate enhancing effect on the ammonium removal. The dependence of k on the current density as well as halide concentration is also discussed in this study.     

Reactions of phosphorus halides with urethane

By the reaction of phosphorus trichloride, thiophosphoryl chloride, phosphorus oxychloride and phosphorus pentachloride with urethane in stoichiometric ratio 1:1 or 1:2 in benzene, compounds of the type

and

(X = S, O or Cl; n = 1 or 2) have been synthesized. A probable mechanism for their formation has also been suggested.     

Preliminary studies on bacterial decolorization of H-acid based azo dye-reactive black 5

A co-culture acclimatized to H-acid was used to degrade Reactive Black 5 (RB 5), a bis azo dye having central H-acid function. The effect of substrate concentration, pH and medium composition on the decolorization has been investigated. Decolorization was found independent of pH. Luria-Bertani broth favored decolorization over Yeast Extract; however further decolorization experiments have been conducted using Yeast Extract. The Michaelis-Menten Kinetic model is found to describe the dependence of specific decolorization rate on the RB 5 dye concentration.     

The arene oxede-oxepine valence isomerization; a dynamic nmr investigation using a prochiral substituent

The geminal -methytene protons in 3-ethylnaphthalene-l,2-oxide show chemical shift nonequivalence in ¹H NMR spectra recorded at ambient temperature consistent with a high barrier to enantiomerization via the orepine tautomer. The methylene protons in -benzoyloxytoluene-2,3-oxide which are a singlet at ambient temperature split into an AB system at -135 °C and there is evidence of ca. 5% of the oxepine isomer. Lineshape analysis of the coalescing arene oxide AB Signals provides the activation parameters for the valence isomerization/degenerate racemization process: ΔGXXX = 7.6 kcal mol^-1, ΔHXXX = 8.6 kcal mol^-l, ΔSXXX= 5.8 cal K^-l mol^-1.