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2. Mechanism
of Ru(VI) catalysis in oxidation of some glycols by alkaline
solution of N-Bromosuccinimide
Ashutosh Kumar↑ and Bharat Singh*
↑Department of Chemistry, S.B. P.G. College, Baragaon, Varanasi.
*Department of Chemistry, University of Allahabad, Allahabad-211002
(India)
Email- bschem_au@yahoo.com
Abstract:
Kinetics of Ru(VI) catalysis in oxidation of diethylene glycol
(DG) and methyl diethylene glycol(MDG) by N-bromosuccinimide (NBS)
in alkaline media have been studied in presence of mercuric
acetate as Br¯ ions scavenger in the temperature range 30-45 °C.
The reactions follow identical complex kinetics, being zero
order in each substrates and OH¯ ions and first order in [Ru(VI)].
First order kinetics with respect to NBS at its low
concentrations shifts to zero order at its high concentrations.
A negative effect of addition of succinimide (reduction product
of NBS) is observed while variation of [Hg(OAc)2] and
ionic strength has no effect on rate of both reactions. Various
activation parameters were calculated and recorded. The products
of the reactions were identified as corresponding acids. A
suitable mechanism in conformity with the kinetic observations
is proposed.
Keywords: Kinetics, mechanism,
Glycols, N-bromosuccinimide, Ru(VI)
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