MAu2GeS4-Chalcogel (M = Co, Ni): Heterogeneous Intra- and Intermolecular Hydroamination Catalysts
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Imaging and Characterization Core Lab
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AbstractHigh surface area macroporous chalcogenide aerogels (chalcogels) MAu2GeS4 (M = Co, Ni) were prepared from K2Au2GeS4 precursor and Co(OAc)2 or NiCl2 by one-pot sol-gel metathesis reactions in aqueous media. The MAu2GeS4-chalcogels were screened for catalytic intramolecular hydroamination of 4-pentyn-1-amine substrate at different temperatures. 87% and 58% conversion was achieved at 100 °C, using CoAu2GeS4- and NiAu2GeS4-chalcogels respectively, and the reaction kinetics follows the first order. It was established that the catalytic performance of the aerogels is associated with the M(2+) centers present in the structure. Intermolecular hydroamination of aniline with 1-R-4-ethynylbenzene (R = -H, -OCH3, -Br, -F) was carried out at 100 °C using CoAu2GeS4-chalcogel catalyst, due to its promising catalytic performance. The CoAu2GeS4-chalcogel regioselectively converted the pair of substrates to respective Markovnikov products, (E)-1-(4-R-phenyl)-N-phenylethan-1-imine, with 38% to 60% conversion.
CitationDavaasuren B, Emwas A-H, Rothenberger A (2017) MAu2GeS4-Chalcogel (M = Co, Ni): Heterogeneous Intra- and Intermolecular Hydroamination Catalysts. Inorganic Chemistry 56: 9609–9616. Available: http://dx.doi.org/10.1021/acs.inorgchem.7b01099.
SponsorsThis research was supported by King Abdullah University of Science and Technology (KAUST) baseline funding. We would like to thank Prof. P. W. Roesky for the advice in catalytic activity measurement and Dr. E. Ahmed for the assistance in chalcogel preparation.
PublisherAmerican Chemical Society (ACS)
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