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Citation: KATRE Yokraj, SINGH Minu, PATIL Sangeeta, SINGH Ajaya K.. Micelle Catalyzed Oxidation of Mannose by N-Bromophthalimide in the Presence of Sulfuric Acid[J]. Acta Physico-Chimica Sinica, ;2009, 25(02): 319-326. doi: 10.3866/PKU.WHXB20090221 shu

Micelle Catalyzed Oxidation of Mannose by N-Bromophthalimide in the Presence of Sulfuric Acid

1.
Department of Chemistry, Kalyan Post Graduate College, Bhilai Nagar, Durg, (C.G.)-490006, India; Department of Chemistry, Vishwanath Yadav Tamaskar Post Graduate Autonomous College, Durg, (C.G.)-490023, India

Received Date: 18 July 2008
Available Online: 28 November 2008

The kinetics of micellar-catalyzed oxidation of mannose by N-bromophthalimide was studied in the presence of sulfuric acid at 313 K. The orders of reaction with respect to [mannose], [oxidant], and [H+] were found to be fractional, first, and negative fractional order, respectively. Anionic micelles of sodiumdodecyl sulfate showed a partial inhibitory effect, while cationic micelles of cetyltrimethylammonium bromide increased the reaction rate with the same kinetic behavior. The reaction was catalyzed by cationic micelles, because of favorable electrostatic/thermodynamic/hydrophobic/hydrogen bonding between reactants and cationic micelles. Their catalytic roles are best explained by Berezin’s model. A variation of [phthalimide] showed that the rate of reaction decreased with increasing [phthalimide]. It was observed that, an increase of [mercuric acetate] had no effect on reaction velocity. The influence of salts on the reaction rate was also studied. The rate constant (kW ), binding constants (KS+KO), and corresponding activation parameters (Ea, ⊿H#, ⊿S#, and ⊿G#) were determined. A detailed mechanism with associated reaction kinetics is presented and discussed.
- Micellar catalysis; Oxidation; Kinetics; Mannose; Berezin’s model
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