Palladium supported on chitosan as a recyclable and selective catalyst for the synthesis of 2-phenyl ethanol

Abstract

Two different chitosan supported palladium based catalysts were prepared, wherein dispersed palladium nanoparticles were obtained via chemical reduction supported on chitosan (Pd/CTS) and amine functionalized modified chitosan (Pd/AFCTS). The catalytic activity of the Pd-based catalysts, Pd/CTS and Pd/AFCTS, were assessed in the hydrogenation of styrene oxide to 2-phenyl ethanol. Both Pd-based catalysts enhanced the formation of the desired 2-phenyl ethanol in contrast to a conventional Pd/C catalyst without the assistance of inorganic or organic base. A considerable influence on the conversion and selectivity was observed in the case of Pd/AFCTS, consisting of palladium nanoparticles stabilized and dispersed on amine-functionalized chitosan matrix, affording complete conversion of styrene oxide with 98% selectivity to 2-phenyl ethanol. The catalyst Pd/AFCTS has also been recycled without significant loss of activity and selectivity.

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

“…These products are valuable chemical intermediates used in perfumery and exhibit fungi bacteriostatic activities [39,47]. On the basis of the styrene oxidation mechanism, styrene oxide and benzaldehyde are the expected products [48,49], even though the former is not produced.…”

Metal-cellulose catalytic systems for biodiesel preparation and reductive stabilization

“…[11][12][13][14] In this regard, the use of heterogeneous catalyst, especially those based upon transitions metal catalysts supported in biopolymers, are attractive for applications in organic synthesis, fine chemical and flow reactors. [15][16][17][18][19][20][21][22]Indeed, several interesting features of the biopolymers, for example, high sorption capacity, stability of metal anions and physical and chemical versatility make them highly attractive to be used as supports.…”

Cucurbit[6]uril-Stabilized Palladium Nanoparticles as a Highly Active Catalyst for Chemoselective Hydrogenation of Various Reducible Groups in Aqueous Media

“…Besides these, nitrogen‐rich organic polymers were also successfully employed as a support for palladium catalyzed hydrogenation of various substrates . However, all these systems are designed to do mostly substrate specific hydrogenation with little or no variation in substrate scope, except for very limited citations where a single support but with some variation in the catalyst preparation was able to handle a variety of substrates ,. Further, there are very few reports where water has been used as reaction medium using specially designed nitrogen‐containing support modified with a long‐chain alkyl group (dodecane) for Pd‐catalyzed chemoselective (terminal) hydrogenation of alkenes …”