MAu2GeS4-Chalcogel (M = Co, Ni): Heterogeneous Intra- and Intermolecular Hydroamination Catalysts

High 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 S8% conversion was achieved at 100 degrees 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 M2+ centers present in the structure. Intermolecular hydroamination of aniline with 1-R-4-ethynyl-bentene (R = -H, -OCH3, -Br, -F) was carried Out at 100 degrees 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.