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Pd(II)
catalyzed and Hg(II)- co-catalysed oxidation of cellobiose by N- bromoacetamide
in the presence of perchloric acid:                                   a
kinetic and  mechanistic study

Kinetic
Study of cellobiose a biologically active organic compound using homogeneously
Pd(II)-catalysed and Hg(II) co-catalysed oxidation by N- bromoacetamide (NBA)
in perchloric acid medium have been made at temperature 400 C± 0.10C
. The kinetic result shows first -order kinetics with respect to NBA at its low
concentrations, tending to zero order at its high concentrations. The oxidation
rate is directly proportional to Pd(II) and sugar, indicating first order
kinetics with respect to Pd(II) and cellobiose. Inverse fractional order i.e
decreasing effect of H+ was observed and zero effect of Cl-
ions throughout their variations have been noted. Variation of mercuric acetate
and acetamide NHA shows positive effect on rate of reaction while the rate of
reaction is not influenced by the change in ionic strength (

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)
of the medium, Further increase in temperature markedly increased the reaction
velocity.

 

Introduction: The aqueous solution of halogen has a strong
oxidizing character. The species responsible for such oxidizing character may
be different depending on the pH of the medium 2-3.The generation and
reactivity of N-halo compounds and their importance in biological systems have
been reviewed (1). Although a lots of works have been reported on the oxidation
of organic compounds by N-halo compounds4-7. Here we report the results of the
kinetics of the oxidation of cellobiose with N-bromoacetamide (NBA) in the
presence of perchloric acid medium. Palladium(II) is a convenient metal for the
coordination of carbohydrates and polyhydroxy compounds. Metal complexes have wide
applications in catalysis, materials synthesis, biological systems and
photochemistry.
Pd(II) catalyst could reduce the environmental impact, and increase the
sustainability, of chemical reactions  Cellobiose probably present in only traces in
nature. However, it is apparently released during the digestion of a
polysaccharide, cellulose by the cellulases of microorganisms. Cellobiose is
identical with maltose except that the former has a ?-1, 4-glucosidic linkage.
On hydrolysis, cellobiose yields glucose units only. 

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