Untitled

Effective and Reusable Pt Catalysts Supported on Periodic Mesoporous Resols for Chiral Hydrogenation

“…Most of these studies focused on commercially available 5.0 wt.% Pt/Al 2 O 3 catalysts [7][8][9][10][11][12][13][14][15][16], e.g. E 4759 from Engelhard or JMC 5 R 94 from Johnson Matthey, or 6.3 wt.% Pt/SiO 2 catalysts [17,18], e.g.…”

Effects of Ultrasound and Microwaves on Selective Reduction: Catalyst Preparation and Reactions

“…[110] Kulkarni and Török recently reviewed the application of US activation in heterogeneous catalytic hydrogenations. [28] In many cases, sonochemical activation also resulted in selectivity enhancement; such as in the hydrogenation of α-ketoesters on cinchona alkaloid modified Pt/Al2O3 catalyst, [115] 3-buten-1-ol Sonication resulted in a two-fold increase (~80% overall selectivity compared with 40 %) in CMO formation.…”

Asymmetric cascade reaction of 2-nitrophenylpyruvates over chirally modified platinum catalyst

“…According to these initial results, similarly as pointed out by Murakami and coworkers [33], the preparation of the hydroquinoline derivatives was possible over supported Pt catalyst, moreover chiral modification by cinchona alkaloids increased the selectivity of the desired product 5. Although, low ee was obtained in this preliminary study the ee value exceeded the one reported in the hydrogenation of activated benzyl ketones over Pt modified by CD [109]. Thus, based on both the selectivity and the ee obtained, we thought worth studying the effect of the reaction conditions for finding possibilities of increasing these values in this novel asymmetric cascade reaction.…”