An article Rh-catalyzed 1,4-addition reactions of arylboronic acids accelerated by co-immobilized tertiary amine in silica mesopores WOS:000472687900001 published article about HETEROGENEOUS SYNERGISTIC CATALYSIS; BOND-FORMING REACTIONS; TSUJI-TROST REACTION; ASYMMETRIC 1,4-ADDITION; COOPERATIVE CATALYSIS; CONJUGATE ADDITION; PHENYLBORONIC ACID; PALLADIUM COMPLEX; BISPHOSPHINE COMPLEX; SUPPORTED CATALYSTS in [Motokura, Ken; Hashiguchi, Kohei; Maeda, Kyogo; Nambo, Masayuki; Manaka, Yuichi] Tokyo Inst Technol, Sch Mat & Chem Technol, Dept Chem Sci & Engn, Midori Ku, 4259 Nagatsuta Cho, Yokohama, Kanagawa 2268502, Japan; [Motokura, Ken] Japan Sci & Technol Agcy JST, PRESTO, Saitama 3320012, Japan; [Manaka, Yuichi] Natl Inst Adv Ind Sci & Technol, Renewable Energy Res Ctr, 2-2-9 Machiikedai, Koriyama, Fukushima 9630298, Japan; [Chun, Wang-Jae] Int Christian Univ, Grad Sch Arts & Sci, Mitaka, Tokyo 1818585, Japan in 2019.0, Cited 65.0. Safety of Chalcone. The Name is Chalcone. Through research, I have a further understanding and discovery of 94-41-7
Mesoporous silica-supported Rh complex catalysts were prepared by simple silane-coupling, followed by cornplexation, and characterized by FT-IR, SEM, Rh K-edge XAFS, and elemental analysis. Local structures of the Rh complexes in each sample were almost similar to those of a nonporous silica-supported diaminorhodiurn complex. Co-immobilization of a tertiary amine on the same silica surface induced slight changes to the Rh complex structure in the case of the support with smaller pores. The prepared catalysts showed high activity for the 1,4 addition reaction of phenylboronic acids. Co-immobilization of the tertiary amine increased the reaction rate by more than 7-fold, with turnover number of nearly 8500. The catalytic performance achieved with this novel system is with much higher than that reported previously with a nonporous silica-supported catalyst. The mesoporous silica-supported Rh complex-tertiary amine showed a wide substrate scope, including unsaturated ketones and nitriles. This co-immobilized tertiary amine may activate phenylboronic acid to enhance its reactivity in the transmetalation step with Rh-OH species.
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