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Bimetallic Oriented ( Au / Cu 2 O) vs. Monometallic 1.1.1 Au (0) or 2.0.0 Cu 2 O Graphene‐Supported Nanoplatelets as Very Efficient Catalysts for Michael and Henry Additions
Author(s) -
Simion Andrada,
Candu Natalia,
Coman Simona M.,
Primo Ana,
EsteveAdell Ivan,
Michelet Véronique,
Parvulescu Vasile I.,
Garcia Hermenegildo
Publication year - 2018
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201801443
Subject(s) - bimetallic strip , catalysis , homogeneous , chemisorption , materials science , chemical engineering , chemistry , physics , organic chemistry , thermodynamics , engineering
Michael and Henry addition reactions have been investigated using mono ( Au and Cu 2 O ) and bimetallic nanoplatelets ( Au / Cu 2 O ) grafted onto few‐layers graphene ( fl‐G ) films as heterogeneous catalysts by comparison with homogeneous NaOH and K 2 CO 3 ones. In the presence of the heterogeneous catalysts, these reactions occurred in the absence of any extrinsic (NaOH and K 2 CO 3 ) base with turnover numbers (TONs) at least four orders of magnitude higher. While the homogeneous catalysts provided TONs close to the unity for Au / Cu 2 O/fl ‐ G this was of the order of 10 7 . These reactions also occurred with a very good selectivity to the targeted products. These performances are in line with the basicity of these catalysts demonstrated from CO 2 chemisorption measurements. The effect of the nanosize and the interaction of the nanoparticles with the graphene are also important to achieve this high activity.