G. Caroling

Bio: G. Caroling is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: N-Methylmorpholine N-oxide & Catalysis. The author has an hindex of 2, co-authored 4 publications receiving 11 citations.

cis‐RuCl2(DMSO)4‐catalyzed oxidation of sulfides by N‐methylmorpholine N‐oxide (NMO)

Abstract: The induction period observed in the cis-RuCl 2 (DMSO) 4 catalyzed oxidation of thioethers (S) to sulfoxides by N-methylmorpholine N-oxide (NMO) is attributed to the rate of formation of the active species viz. RuCl 2 (DMSO) 3 S. Cyclic voltammetric studies indicate formation of the Ru IV =0 species. Based on the variable orders in NMO and first order in each of the other reactants, a mechanism is proposed where the active species generated in situ reacts with NMO in a slow step to form Ru IV oxo complex which then decomposes to give the product

Kinetics and mechanism of Ru(III)-catalysed oxidation of organic sulphides and triphenylphosphine by N-methylmorpholine N-oxide

Abstract: The selective oxidation of thioethers to sulphoxides and of PPh3 to PPh3O can be effected by NMO in DMF as solvent in the presence of Ru(III) chloride as catalyst. Kinetic investigations indicate that the orders with respect to the catalyst and oxidant are one each. The order with respect to the substrate is variable being fractional order at low concentrations and zero at high concentrations. Spectrophotometric studies reveal the formation of a 1:1 complex between the substrate and the catalyst. A mechanism consistent with the above observations has been proposed and verified.

cis‐RuCl2(DMSO)4‐Catalyzed Oxidation of Sulfides by N‐Methylmorpholine N‐Oxide (NMO)

Abstract: The induction period observed in the cis-RuCl 2 (DMSO) 4 catalyzed oxidation of thioethers (S) to sulfoxides by N-methylmorpholine N-oxide (NMO) is attributed to the rate of formation of the active species viz. RuCl 2 (DMSO) 3 S. Cyclic voltammetric studies indicate formation of the Ru IV =0 species. Based on the variable orders in NMO and first order in each of the other reactants, a mechanism is proposed where the active species generated in situ reacts with NMO in a slow step to form Ru IV oxo complex which then decomposes to give the product

The Chemistry of Ruthenium Oxidation Complexes

Abstract: This chapter introduces the topic and scope of the book and principally concerns the basic preparation, physical and chemical properties of Ru-based ­oxidation catalysts, then summarising the catalytic oxidations which they accomplish. More detail on these is given in the succeeding four chapters. The major oxidants RuO4 (1.2.1), perruthenate [RuO4]− (1.3.1) – mainly TPAP, (nPr4N)[RuO4], ruthenate [RuO4]2− (1.4.1), trans-Ru(O)2(TMP) (1.4.2.5), RuCl2(PPh3)3 (1.9.3) and cis-RuCl2(dmso)4 (1.9.4) are covered in some detail, but many other catalysts are also discussed. In some cases brief comments are made on the mechanisms involved when data on these are given in the cited papers. There is also an Appendix (1.11) which gives brief details on the preparation of four ruthenium oxidation catalysts and selected model oxidations using them.

Ru (III) catalyzed oxidation of aliphatic ketones by N-bromosuccinimide in aqueous acetic acid: a kinetic study.

Abstract: 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.