Sodium dodecylsulphate-catalyzed hetero-aromatic nitrogen base-promoted chromium(VI) oxidation of 2-propenol to 2-propenal in aqueous media

Abstract

A kinetic study of homogeneously micelle-catalyzed, hetero-aromatic Nbase (2-picolinic acid, 2,2 0 -bipyridine and 1,10-phenanthroline)-promoted oxidation of 2-propenol by chromium(VI) in sulfuric acid medium was carried out at 303 K. The pseudo first-order rate constant (k obs ) of the oxidation reaction is directly proportional to [H ? ] and [promoters], which indicates that the reaction is first order with respect to H ? and promoters. The reaction was conducted at four different temperatures from which the activation parameters were calculated. Proton nuclear magnetic resonance ( 1 H-NMR) studies were performed to detect the location of reactant molecules in nanometersized micelles. From the observed kinetic results, a suitable mechanism consistent with the rate law has been proposed. The micelles produced a catalytic effect in the entire range of sodium dodecylsulphate (SDS) concentrations used, and the effect is explained by pseudo-phase ion exchange. The combination of 2,2 0 -bipyridine (bipy) and SDS exhibited a 15-fold rate enhancement of Cr(VI) oxidation of 2-propenol to 2-propenal. Electronic supplementary material The online version of this article (Graphical Abstract Ultraviolet-visible (UV-Vis) spectrum of reaction mixture for the Cr(VI) oxidation of 2-propenol with varying solution colour at different reaction times. Right: Location of reactant molecule in the micellar pseudophase region.

A promising mixed micellar approach to tune the oxidation of isoprenol by diperiodatoargentate(iii) in aqueous media

“…In fact, the hydrophobic nature of the isoprenol molecule facilitates it to reside at the palisade layer of micelle; on the condition that the -OH functionality of isoprenol tends to orient towards the stern layer of micelle. 58,59 The reaction rate increases as a result of this beneficial approach of reacting species towards the micellar surface. Table 3 shows that, after CMC, the rate constant of the oxidation increases with an increase in surfactant concentrations.…”

Surfactant for better tomorrow: applied aspect of surfactant aggregates from laboratory to industry

“…(a) A strong electrostatic or Coulombic interactions between the oppositely charged micelles and the accumulated active oxidant species at stern layer of micelle is another one forceful factor behind the micellar catalysis [81][82][83][84][85][86][87][88][89][90].…”