Palladium acetate anchored to a copolymer containing pyridyl and carboxyl groups has been employed as a catalyst for the hydrogenation of azo and nitro groups under 1 atm hydrogen pressure and 30°C. The selective hydrogenation of azobenzene using a polymer-bound palladium catalyst is reported for the first time. Kinetic data on the hydrogenation of azo-benzene are also presented. © 1991.

Venkatanarayana Mahadevan

AROMATIC COMPOUNDS - HYDROGENATION

METALLORGANIC POLYMERS - APPLICATIONS

NITROGEN COMPOUNDS - HYDROGENATION

ORGANIC COMPOUNDS - REDUCTION

PALLADIUM COMPOUNDS - APPLICATIONS

AZOBENZENE HYDROGENATION

HYDROGEN PRESSURE EFFECT

KINETICS STUDIES

NITROCOMPOUND HYDROGENATION

REACTANT CONCENTRATION EFFECTS

CATALYSTS

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

Polymer-bound palladium acetate as a catalyst for the reduction of nitro and azo groups

Reactive Polymers

Palladium(II) acetate has been anchored onto a copolymer support containing pyridyl and carboxyl groups. XPS studies showed the Pd 3d binding energies for the recovered catalyst to be less by 1 eV after being used in hydrogenation studies. However, x-ray studies and a chemical test based on KCN treatment failed to reveal any palladium oxide or palladium metal formation in the recovered catalyst. It is presumed that an acetate ligand is lost during hydrogenation, which could be the reason for the lowering of the palladium 3d binding energies in the recovered catalyst. Results of investigations of the hydrogenation of olefins and selectivity of the catalyst toward the hydrogenation of dienes and alkynes are presented. The loss of palladium due to leaching under the reaction conditions employed was found to be very low (< 1 %/cycle). © 1993, Taylor & Francis Group, LLC. All rights reserved.

Journal of Macromolecular Science, Part A

Characterization of a polymer-bound palladium acetate catalyst and studies on the selective hydrogenation of dienes and alkynes

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

British Polymer Journal

Studies on the hydrogenation of olefins using polymer-bound palladium (II) species

Tetrahedron Letters

Selective and sequential reduction of nitroaromatics by montmorillonitesilylaminepalladium(II) complex

Journal of Macromolecular Science: Part A - Chemistry

Double Carbonylation of Organohalogen Compounds Catalyzed by Polymer-Bound Palladium Complexes

Die Makromolekulare Chemie, Rapid Communications

10.1002/marc.1986.030070405

Journal	Reactive Polymers
ISSN	09231137
Open Access	No