Search results
Search for "immobilized catalysts" in Full Text gives 8 result(s) in Beilstein Journal of Organic Chemistry.
Recent developments and trends in the iron- and cobalt-catalyzed Sonogashira reactions
Beilstein J. Org. Chem. 2022, 18, 262–285, doi:10.3762/bjoc.18.31
- -azaindole derivatives under microwave irradiation that helps to reduce the reaction time and minimizes side product formation. Co-catalyzed Sonogashira cross-coupling reactions Nanoparticle-based protocols The advantages of using immobilized catalysts include the possibility of the catalyst to be easily
- recovered and reused, but it could also result in a reduced metal contamination of the products. However, most of the immobilized catalysts suffer from some problems like catalyst deactivation, low turnover numbers, and also leaching of metal. A new heterogeneous cobalt catalyst (Co@imine-porous organic
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
- -worker, these in situ-generated catalytic species can give rise to cocktail-type systems with different active metal species present in solution [14]. In the case of immobilized catalysts, these palladium species can be released from the support reacting in the homogeneous medium transformed from Pd0 to
Ugi reaction-derived prolyl peptide catalysts grafted on the renewable polymer polyfurfuryl alcohol for applications in heterogeneous enamine catalysis
Beilstein J. Org. Chem. 2019, 15, 1210–1216, doi:10.3762/bjoc.15.118
- -supported chiral organocatalysts usually provides a much greener prospect for the synthesis of enantiomerically enriched building blocks [4][5][6]. Importantly, immobilized catalysts allow for both recyclability of the catalyst and the implementation of continuous-flow procedures, which usually encompass
Syntheses and chemical properties of β-nicotinamide riboside and its analogues and derivatives
Beilstein J. Org. Chem. 2019, 15, 401–430, doi:10.3762/bjoc.15.36
- pyridinium ring (see Figure 7). A comprehensive review on the chemistry of homogeneous and heterogeneous catalytic, electrochemical, photocatalytic, and immobilized catalysts-based regeneration of NAD(P)H was published by Wang et al. [84]. 3.4. Modifications on the 5′-position of unprotected and partially
Investigations towards the stereoselective organocatalyzed Michael addition of dimethyl malonate to a racemic nitroalkene: possible route to the 4-methylpregabalin core structure
Beilstein J. Org. Chem. 2018, 14, 553–559, doi:10.3762/bjoc.14.42
- ][21]. Other green chemistry concepts such as reusable media [22], immobilized catalysts [23], or flow set-ups have also been used with success for the synthesis of GABA derivatives [24]. Pregabalin is currently manufactured using enzymatic kinetic resolution [25], but an organocatalytic procedure
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
- -immobilized catalysts; proline; Introduction Optically active α-hydroxycarbonyl moieties are highly versatile functional synthons and are present in a wide range of biologically active natural products [1][2]. Traditional strategies for the preparation of these kinds of synthons involves the oxidation of
- limitation is the development of reusable immobilized catalysts, thus allowing important reductions of the “effective” catalyst loading (through recycling and repeated use). Different approaches have been used for the development of immobilized analogs of proline and other organic catalysts. Among them, a
- aldehydes. Results and Discussion The preparation of the immobilized catalysts 1a and 1b was easily achieved by a modification of the reported procedure [41][42][43], with the tris(triazolyl)methyl copper complex 3 [76] as the catalyst for the CuAAC reaction between azidomethylpolystyrene, prepared from a
Efficient and selective chemical transformations under flow conditions: The combination of supported catalysts and supercritical fluids
Beilstein J. Org. Chem. 2011, 7, 1347–1359, doi:10.3762/bjoc.7.159
- to a limited number of fields, a significant development in this area can be envisaged for the near future due to the clear advantages of these systems over the conventional ones. Keywords: biphasic systems; continuous flow processes; enantioselective catalysis; immobilized catalysts; polymer
- homogeneous scFs media can be altered by changing these parameters [26][27]. Selected examples of phase equilibrium-controlled chemical reaction kinetics in high pressure CO2 have been reviewed elsewhere [28]. Nevertheless, examples exploiting the great potential of the combined use of immobilized catalysts
- with scFs under continuous flow conditions for chemo- or enantioselective transformations are still limited. The reactions based on the combination of immobilized catalysts and scFs are usually performed under batch conditions [29][30]. The main aim of this paper is to highlight the advantages of the
Hoveyda–Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves MCM-41 and SBA-15
Beilstein J. Org. Chem. 2011, 7, 22–28, doi:10.3762/bjoc.7.4
- molecular sieves MCM-41 and on SBA-15 by direct interaction with the sieve wall surface. The immobilized catalysts exhibited high activity and nearly 100% selectivity in several types of alkene metathesis reactions. Ru leaching was found to depend on the substrate and solvent used (the lowest leaching was
Other Beilstein-Institut Open Science Activities
