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Gold Nanoparticle–Polydopamine–Reduced Graphene Oxide Ternary Nanocomposite as an Efficient Catalyst for Selective Oxidation of Benzylic C(sp 3 )−H Bonds Under Mild Conditions
Author(s) -
Majumdar Biju,
Bhattacharya Tamalika,
Sarma Tridib K.
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201600136
Subject(s) - nanocomposite , graphene , ternary operation , catalysis , oxide , nanoparticle , selectivity , chemical engineering , chemistry , electron transfer , materials science , photochemistry , organic chemistry , nanotechnology , computer science , engineering , programming language
A ternary nanocomposite comprising of Au nanoparticles (NPs), polydopamine, and reduced graphene oxide exhibits excellent activity and selectivity towards the oxidation of C−H bonds in benzylic hydrocarbons under mild conditions in the presence of N ‐hydroxyphthalimide. All the components in the nanocomposite play an important role in the effectiveness of the catalyst. Sufficient electron transfer from polydopamine to the Au NPs afforded a more negatively charged nanoparticle surface and was favorable for molecular oxygen activation, leading to C−H bond oxidation. The reaction followed a free radical pathway as shown by detailed mechanistic studies. Further, easy separation and excellent reusability without significant loss in activity over several iterations make the ternary nanocomposite an excellent heterogeneous catalyst for C−H oxidation reactions.