Facile synthesis of palladium nanoparticles supported on silica: An efficient phosphirie-free heterogeneous catalyst for Suzuki coupling in aqueous media

resumo

A convenient one-step method for synthesizing highly dispersed palladium nanoparticles supported on silica, without taking assistance from any external reductant or stabilizer, has been developed. The supported nanoparticles were characterized by N-2-adsorption desorption, XRD, HRTEM, SEM-EDX, XPS, ICP analyses and applied as catalyst for Suzuki-Miyaura reactions of aryl halides. The reactions with aryl bromides were performed in neat water at room temperature; while the reactions with aryl chlorides were conducted in aqueous-ethanol at 90 degrees C. The catalyst could be reused at least three times without compromising with its activity, however from the fourth cycle a progressive decrease in yield was noticed. No aggregation of NPs was observed by the TEM analysis of the six-time used catalyst. (C) 2016 Elsevier B.V. All rights reserved.

palavras-chave

MIYAURA REACTION; PD; CARBON; WATER; AMINE

categoria

Chemistry

autores

Sahu, D; Silva, AR; Das, P

nossos autores

Grupos

agradecimentos

The CSIR, New Delhi, is gratefully acknowledged for financial support (Grant no: 02/0081/12). The UGC New Delhi was also acknowledged for SAP-DRS programme and for providing fellowship to D.S.

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