The synthesis and characterisation of copolymers containing tertiary nitrogen to which Cu(I) or Cu(II) species are anchored is described. The anchored species function as catalysts for the oxidation of 2,6-xylenol by O2 under basic conditions. The kinetics of these oxidations have been followed by monitoring oxygen uptake as a function of pH, temperature, reactant concentrations, oxygen partial pressure and catalyst loading. A suitable mechanism is proposed to account for the kinetics as well as the formation of the product, diphenoquinone. Recycling efficiencies of the catalysts are found to be good. © 1997 Published by Elsevier Science Ltd. All rights reserved.

Venkatanarayana Mahadevan

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

The oxidation of 2,6-xylenol catalysed by polymer supported copper complexes

Polymer

The synthesis of new hydrogel copolymers and their use for anchoring Pd and Pt species is described. The supported catalysts are effective for the reduction of alkenes, dienes, alkynes, and nitroaromatics under mild conditions. The catalysts have been characterized by chemical analysis, particle size measurement, IR, TGA, and x‐ray photoelectron spectra. Relative reactivities and the effects of substrate structure, solvents, catalyst loading, particle size of the catalysts, and partial pressure of hydrogen have been determined. The kinetics of hydrogenation have been analyzed using concepts useful under slurry reaction conditions. The recycling efficiencies of the catalysts and product analysis to establish selectivities have been assessed. © 1992 John Wiley & Sons, Inc. Copyright © 1992 John Wiley & Sons, Inc.

Journal of Polymer Science Part A: Polymer Chemistry

Polymer‐supported palladium and platinum species as hydrogenation catalysts

Synthesis of new hydrogel polymers based on 2-hydroxyethyl methacrylate and other functional monomers is described. These copolymers are useful for anchoring palladium and rhodium species. The resulting supported catalysts are effective for the hydrogenation of alkenes, alkynes and dienes under mild conditions. The supported catalysts have been characterised by chemical analysis, particle size measurements, IR, TGA and X-ray photoelectron spectra. Kinetics of hydrogenation have been evaluated using the concepts applicable to slurry reactors. The hydrogenation proceed through the 'unsaturate route'. Relative reactivities of a few substrates, solvent and particle size effects and selectivities by product analysis have been assessed. These catalysts possess excellent recycling efficiencies. © 1990.

Journal of Molecular Catalysis

Transition metal ions supported on hydrogels as hydrogenation catalysts

A polymer-supported Pd(II) species has been prepared by means of an oxidative addition reaction between Pd(PPh3)4 and chloromethylated crosslinked polystyrene. This catalyst has been used for the hydrogenation of alkenes and alkynes under mild conditions. Quantitative studies on the rates of hydrogenation of selected substrates are reported with the mechanisms being discussed. Data on the high recycling efficiency of the catalyst as well as solvent effects on the reaction are presented. Comparisons of the catalyst with earlier reported Pd(II) species supported on polystyrene have been made. © 1985.

Journal of Catalysis

Hydrogenation of alkenes and alkynes catalyzed by polymer-bound palladium(II) complexes

Role of aliphatic diamine ligands in hydrogen peroxide decomposition with Dowex-50W resin as transition metal complex ions

Studies on immobilized polymer-bound imidazole-copper(ii) complexes as catalysts: 1. Oxidative coupling polymerization of 2,6-dimethylphenol catalysed by copper(ii) complexes of poly(styrene-co-N-vinylimidazole)

Journal	Data powered by TypesetPolymer
Publisher	Data powered by TypesetElsevier BV
ISSN	00323861
Open Access	No