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Title: Kinetics of Ru (III)-catalysed Oxidation of Chalcones by Acid Bromate in H2SO4 -HOAc Medium
Authors: Char, P Narasimha
Sondu, S
Sethuram, B
Rao, T Navaneeth
Issue Date: Jan-1989
Publisher: NISCAIR-CSIR, India
Abstract: Kinetics of Ru(III) chloride catalysed oxidation of chalcone and some substituted chalcones by acid bromate have been studied in acetic acid-sulphuric acid medium in the temperature range 303-318 K. The reaction is first order each in [chalcone] and [Ru(III)] and zero order each in [H +] and [BrO)]. The rate increases with increase in the percentage of acetic acid and the plot of log ko versus 1/D is linear with a positive slope indicating the positive ion-dipole nature of the reaction. The order of reactivities of various substituted chalcones with substituents in phenyl ring is: p-CH3 > m-CH3 > H > p-Cl > m-NO2 > p-NO2. A radical mechanism involving the chalcone and Ru(III) in the slow step followed by oxidation of Ru(II) by BrO to Ru(III) in the fast step is proposed.
Page(s): 36-39
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.28A(01) [January 1989]

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