Synergistic Effect of [Ru(III) + Ir(III)] in N-Bromosuccinimide Reaction with Certain Aliphatic Ketones: A Kinetic Study | Zendy

P. Giridhar Reddy | Zendy; K. Ramesh | Zendy; S. Shylaja | Zendy; K. C. Rajanna | Zendy; Sushama Kandlikar | Zendy

Open Access

Synergistic Effect of [Ru(III) + Ir(III)] in N-Bromosuccinimide Reaction with Certain Aliphatic Ketones: A Kinetic Study

Author(s) -

P. Giridhar Reddy,

K. Ramesh,

S. Shylaja,

K. C. Rajanna,

Sushama Kandlikar

Publication year - 2012

Publication title -

advances in physical chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.269

H-Index - 17

eISSN - 1687-7993

pISSN - 1687-7985

DOI - 10.1155/2012/292908

Subject(s) - ketone , chemistry , catalysis , acetone , rate determining step , medicinal chemistry , n bromosuccinimide , ruthenium , metal , limiting , reaction rate , reaction mechanism , inorganic chemistry , nuclear chemistry , organic chemistry , halogenation , mechanical engineering , engineering

Dramatic rate enhancements have been observed in the oxidation of acetone (MMK), ethyl methyl ketone (EMK), and isobutyl methyl ketone (IBMK) by N-bromosuccinimide (NBS) in the presence of a mixture of metal ions [Ru(III) + Ir(III)]. The rate of oxidation in the the [Ru(III) + Ir(III)] system is much faster than either in the Ru(III) or in Ir(III) catalyzed system. The order in [NBS] was found to be zero both in catalyzed as well as uncatalyzed reactions. However, the order in [ketone] changed from unity to a fractional one in metal ion catalyzed systems. On the basis of kinetic features, the most plausible mechanism involving the oxidation of [Ir(III)-ketone] by Ru(III) to give [Ir(V)-ketone] and Ru(I) in the rate limiting step is proposed. Ru(I) thus formed is oxidized by NBS to Ru(III) in a fast step is discussed and individual rate parameters were evaluated

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