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Showing 1 to 11 of 11 for “"Aqueous Biphasic"”.
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Alkylated PTA platforms for mono- and polynuclear pre-catalysts for the aqueous biphasic hydroformylation of 1-octene
… were evaluated as catalyst precursors in the aqueous biphasic hydroformylation of 1-octene. The hydroformylation reactions showed that the complexes (6 – 18) were all active when used as catalyst precursors in the aqueous biphasic hydroformylation of 1-octene to yield aldehydes (linear and …
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Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts
… were evaluated as pre-catalysts for the aqueous biphasic hydro formylation of 1-octene.The mononuclear ferrocenyl complexes were inactive in the aqueous biphasic hydroformylation experiments. Hydroformylation using the heterobimetallic complexes showed that the pre-catalysts are active in …
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Stapling and Unstapling Peptides and Proteins With S-Tetrazine
… groups of unprotected peptides conducted with aqueous biphasic conditions, permitting the con-struction of macrocyclic peptides with a wide range of functionally and ring topology, bridging from one to 27 amino acid residues adjoining the cysteines. Importantly, the sta-pled conformations were …
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Monometallic and multimetallic complexes as precatalysts in the hydroformylation of olefins
… were successfully evaluated as precursors in the aqueous biphasic hydroformylation of higher olefins. Optimisation experiments using the mononuclear precatalyst gave the best results at 85 ℃, 50 bar syngas pressure for 4 h with 2.87 x 10-3 mmol Rh loading and a substrate (1-octene) to catalyst …
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Synthesis and Characterization of Ruthenium (II) Complexes and their Applications to Atom Transfer Radical Addition Reactions
… of ,-unsaturated carbonyl compounds in aqueous-biphasic mediaG Jlectrochemical studies on some of the Cp#Ru(PR3)(PPh3)Cl complexes in dichloromethane are also reported.
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Absorption based processes applying phase transition for energy efficient postcombustion CO2 capture
The conventional CO2 absorption process, using an aqueous 30 wt% monoethanolamine (MEA) solvent for postcombustion CO2 capture, is energy intensive and thus costly. The novel phase transitional CO2 absorption process has been regarded as a promising alternative to the benchmark MEA process. The …
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Water-in Water (W/W) Emulsion Drug Delivery Systems
Water-in water (W/W) emulsions of aqueous biphasic polymer coacervates have very low interfacial tensions and small differences in density between the two phases. While they are inherently kinetically unstable, they cannot be stabilized using surfactants or colloidal particles. This research is …
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Hemilabile Phosphorus Enamine/Imine Ligands And Their Application In Ru-Catalyzed Aqueous Hydration Of Nitriles
The insertion of aromatic nitriles into the C-Li bond of PTA-Li gave a new series of P,N k2-enaminophosphine derivatives (PTA=C(R)NH2) of 1,3,5-triaza-7-phosphaadamantane (PTA), with a characteristic double bond on the PTA cage. Oxidation or sulfuration of the ligands resulted in a mixture of …
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Increasing the Stability and Turnover Number of a Highly Active Iron Catalyst for the Asymmetric Transfer Hydrogenation of Ketones
… limitations caused by the formation of a biphasic reaction mixture. The maximum TON was 199, which rivals platinoid metal catalysts in similar biphasic systems. Finally, a variant of the iron catalyst was successfully covalently bonded to polystyrene, silica gel, and polyethylene glycol …
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Determination of descriptors by liquid-liquid partition and chromatographic methods
… were determined for several totally organic biphasic systems using formamide, propylene carbonate, ethylene glycol or dimethyl sulfoxide as the base solvent and n-heptane, 1,2-dichloroethane, 1-octanol or isopentyl ether as the counter solvent. These partition coefficient databases are …
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Design, Synthesis and Catalytic Evaluation of Mono- and Polynuclear Organometallic Materials as Hydroformylation Catalysts
… were evaluated as catalyst precursors in the aqueous biphasic hydroformylation of 1-octene under hydroformylation conditions of 75 ℃, 40 bar syngas pressure for 4 h. Both catalyst precursors gave good catalytic conversion (> 96%) and aldehyde chemoselectivity (> 87%). Notably, the presence of …