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Search for "immobilized catalyst" in Full Text gives 9 result(s) in Beilstein Journal of Organic Chemistry.
Synergy between supported ionic liquid-like phases and immobilized palladium N-heterocyclic carbene–phosphine complexes for the Negishi reaction under flow conditions
Beilstein J. Org. Chem. 2020, 16, 1924–1935, doi:10.3762/bjoc.16.159
- of the NHC–Pd catalyst and the SILLPs is a key factor for the optimization of the release and catch mechanism leading to a catalytic system easily recoverable and reusable for a large number of catalytic cycles enhancing the long-term catalytic performance. Keywords: immobilized catalyst; Negishi
The charge-assisted hydrogen-bonded organic framework (CAHOF) self-assembled from the conjugated acid of tetrakis(4-aminophenyl)methane and 2,6-naphthalenedisulfonate as a new class of recyclable Brønsted acid catalysts
Beilstein J. Org. Chem. 2020, 16, 1124–1134, doi:10.3762/bjoc.16.99
- polymeric matrix and the low availability of the active sites to the substrates due to diffusion problems. Additionally, the self-association of catalytic centers on flexible polymeric chains may negatively influence the expected activity of the immobilized catalyst. Moreover, the degradation of cross
Supported bifunctional thioureas as recoverable and reusable catalysts for enantioselective nitro-Michael reactions
Beilstein J. Org. Chem. 2016, 12, 628–635, doi:10.3762/bjoc.12.61
- from the reaction mixtures by filtration, thoroughly washed with methanol, dried and reused in the next cycle. General procedure for the Michael addition of 2-nitrocyclohexanone to β-nitrostyrene using immobilized catalyst VI Method A, in organic solvent: The reactions were carried out as previously
Recent advances in metathesis-derived polymers containing transition metals in the side chain
Beilstein J. Org. Chem. 2015, 11, 2747–2762, doi:10.3762/bjoc.11.296
- copolymer 39 (Scheme 16). Remarkably, in water, this Rh-containing block copolymer readily generated micelles and could be thus successfully employed as a Rh-immobilized catalyst for the hydroformylation of 1-octene. Very recently, Matyjaszewski, Tang and coworkers [62] reported the first synthesis of
Aqueous reductive amination using a dendritic metal catalyst in a dialysis bag
Beilstein J. Org. Chem. 2013, 9, 960–965, doi:10.3762/bjoc.9.110
- , the G4 catalyst 17 was equally active in a second run, clearly demonstrating the viability of containment of the catalyst in the dialysis bag. This result also suggests that the immobilized catalyst should be applicable in cascade reactions with reagents that are normally incompatible with the iridium
Combined bead polymerization and Cinchona organocatalyst immobilization by thiol–ene addition
Beilstein J. Org. Chem. 2012, 8, 1126–1133, doi:10.3762/bjoc.8.125
- supported thiourea catalyst 12 in the Michael addition of thiophenol and cyclohex-2-enone [17], a transformation known to be very efficiently catalysed by the free thiourea catalyst 3 (Table 3) [19][20]. The immobilized catalyst 12 proved highly active (the uncatalysed reaction is very slow), rapidly giving
Continuous-flow enantioselective α-aminoxylation of aldehydes catalyzed by a polystyrene-immobilized hydroxyproline
Beilstein J. Org. Chem. 2011, 7, 1486–1493, doi:10.3762/bjoc.7.172
- , 0.72 M) were prepared. Both solutions were separately pumped at a rate of 0.12 mL·min–1 each through a glass column containing the immobilized catalyst 1a (300 mg, 0.144 mmol), which had been previously swollen with chloroform. The effluent of the column was collected in a closed flask cooled down to
Continuous flow enantioselective arylation of aldehydes with ArZnEt using triarylboroxins as the ultimate source of aryl groups
Beilstein J. Org. Chem. 2009, 5, No. 56, doi:10.3762/bjoc.5.56
- group source. Results and Discussion Preparation of the immobilized catalyst Resin 2 was prepared in three steps from commercially available triphenylethylene according to a reported procedure [21]. In the key steps, enantiomerically pure triphenylethylene oxide [58] is submitted to regioselective and
Asymmetric reactions in continuous flow
Beilstein J. Org. Chem. 2009, 5, No. 19, doi:10.3762/bjoc.5.19
- in continuous flow asymmetric reactions using immobilized catalyst systems. An asymmetric reaction that has been examined extensively in continuous flow using supported catalysts is the enantioselective addition of diethylzinc to benzaldehyde [23][24][25][26][27][28]. A fast, single pass continuous
- unmodified silica lowered the activity of the catalyst system, presumably via adsorption of some of the Ru(II) catalyst. Under optimal flow conditions, the transfer hydrogenation of acetophenone in isopropanol (using a flow-reactor consisting of a column packed with a slurry of the immobilized catalyst
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