scholarly journals Ru (III) Catalyzed Oxidation of Aliphatic Ketones by N-Bromosuccinimide in Aqueous Acetic Acid: A Kinetic Study

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
P. Giridhar Reddy ◽  
K. Ramesh ◽  
S. Shylaja ◽  
K. C. Rajanna ◽  
S. Kandlikar
Keyword(s):  
Aqueous Acetic Acid ◽  
Diethyl Ketone ◽  
Aqueous Acid ◽  
Ethyl Methyl ◽  
Aliphatic Ketones ◽  
Ethyl Methyl Ketone ◽  
Individual Rate ◽  
Kinetics Of ◽  
Catalyzed Oxidation ◽  
Kinetic Features

Kinetics of Ru (III) catalyzed oxidation of aliphatic ketones such as acetone, ethyl methyl ketone, diethyl ketone, iso-butylmethyl ketone by N-bromosuccinimide in the presence of Hg(II) acetate have been studied in aqueous acid medium. The order of [N-bromosuccinimide] was found to be zero both in catalyzed as well as uncatalyzed reactions. However, the order of [ketone] changed from unity to a fractional one in the presence of Ru (III). On the basis of kinetic features, the probable mechanisms are discussed and individual rate parameters evaluated.

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

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
P. Giridhar Reddy ◽  
K. Ramesh ◽  
S. Shylaja ◽  
K. C. Rajanna ◽  
S. Kandlikar
Keyword(s):  
Metal Ion ◽  
Methyl Ketone ◽  
Ethyl Methyl ◽  
Rate Limiting Step ◽  
Aliphatic Ketones ◽  
Ethyl Methyl Ketone ◽  
Plausible Mechanism ◽  
Rate Limiting ◽  
Individual Rate ◽  
Kinetic Features

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.

Complexes of cobalt(II) and nickel(II) with some bidentate thiosemicarbazones

1975 ◽  
Vol 28 (2) ◽  
pp. 305 ◽  
Author(s):  
MA Malik ◽  
DJ Phillips
Keyword(s):  
Electronic Spectra ◽  
Metal Ion ◽  
Methyl Ketone ◽  
Magnetic Measurements ◽  
Diethyl Ketone ◽  
Ethyl Methyl ◽  
Thiosemicarbazone Ligand ◽  
Ethyl Methyl Ketone ◽  
Tetrahedral Complexes ◽  
Benzaldehyde Thiosemicarbazone

Some new, and some previously reported, bis-chelate complexes of bidentate thiosemicarbazones with a range of cobalt(II) and nickel(II) salts have been isolated, and they have been characterized by infrared and electronic spectra, and by magnetic measurements. The complexes are those of the thiosemicarbazones of acetone, diethyl ketone and cyclopentanone with nickel(II), and the thiosemicarbazones of acetone, ethyl methyl ketone, cyclopentanone and benzaldehyde with cobalt(II). They all have the composition M(tsc)2X2 (some being obtained with solvent of crystallization), and the influence of metal ion M, the thiosemicarbazone ligand tsc, and the anion X on the structures is examined. The non-aromatic thiosemicarbazones gave five-coordinate halo complexes of general type [M(tsc)2X] X (M = Co, Ni; X = halide). The nitrates appear to have formally six-coordinate structures of type [M(tsc)2(NO3)]NO3 involving one bidentate nitrate, although the electronic spectra suggest that the coordination environments of the metal ions resemble those of five- rather than six-coordinate complexes. The thiocyanato and perchlorato complexes are considered to be five-coordinate with cobalt and six-coordinate with nickel. Benzaldehyde thiosemicarbazone (bztsc) did not yield nickel(II) complexes, but gave tetrahedral complexes [Co(bztsc)2] X2 with X = halide, and a six-coordinate thiocyanato complex [Co(bztsc)2(NCS)2] whose reflectance spectrum may show the effects of tetragonal distortion.

Volumes of mixing and viscosities of liquid mixtures of ketones and o-chlorophenol

1970 ◽  
Vol 23 (5) ◽  
pp. 967 ◽  
Author(s):  
PR Naidu
Keyword(s):  
Methyl Ketone ◽  
Liquid Mixtures ◽  
Diethyl Ketone ◽  
Ethyl Methyl ◽  
Ideal Solutions ◽  
Propyl Ketone ◽  
Volumes Of Mixing ◽  
Ethyl Methyl Ketone ◽  
Methyl Propyl Ketone

Volumes of mixing and viscosities of o-chlorophenol in ethyl methyl ketone, methyl propyl ketone, diethyl ketone, and isobutyl methyl ketone have been determined at 30.0�. Volumes of mixing have been examined on the basis of electron-donating capacities of the ketones. Viscosities of the mixtures have been used to test the validity of viscosity relations developed for non-ideal solutions.

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