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Showing 1 to 20 of 41 for “"hydroformylation"”.
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Rhodium-zeolite hydroformylation of propylene
… exchanged NaX and NaY zeolites as propylene hydroformylation catalysts. Catalytic activity was measured in a differential bed reactor. Flow in situ infrared spectroscopy was used to probe the coordination chemistry of the zeolite modified rhodium carbonyls. The catalytic activity of rhodium …
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Liquid phase hydroformylation by zeolite supported rhodium
… rhodium species as catalysts for liquid phase hydroformylation of 1-hexene in order to study the effects of zeolite immobilization. NaX zeolite was cation exchanged with several rhodium salts and used as hydroformylation catalysts at 50°C and 125°C in the presence of: triphenylphosphine (PPh₃), …
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Dendritic rhodium catalyst precursors for the hydroformylation of olefins
The hydroformylation reaction is the transition-metal catalysed addition of CO/H2 to olefins, resulting in linear and/or branched aldehydes. This reaction is in accordance with Green Chemistry principles, as it operates with 100% atom efficiency and uses renewable feedstocks such as olefins from …
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Spectroscopic and synthetic studies relating to a dirhodium hydroformylation catalyst
… to further study and characterize our bimetallic hydroformylation catalyst, rac-[Rh<sub>2</sub>(nbd)<sub>2</sub>(et,ph-P4)](BF<sub>4</sub>)<sub>2</sub>, and to fully identify the catalytically inactive mono- and dirhodium complexes formed upon fragmentation of the catalyst under hydroformylation …
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An investigation into the alkene hydroformylation reaction using platinum complexes
Hydroformylation is the most widely applied homogeneous catalysis reaction used in industry. The aldehyde product is an important commodity in both the bulk and specialty chemical industry. Platinum catalysts have shown significant chemo- and regioselectivities in alkene hydroformylation. This …
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Activating Aldehyde C-H Bonds: Applications to Hydroacylation and Transfer Hydroformylation
… enables developments in hydroacylation and hydroformylation. Chapter 1 describes a cooperative catalysis strategy for branched-selective hydroacylation of alkenyl alcohols with salicylaldehydes. A phosphinite ligand reversibly binds the alkenyl alcohol to promote an intermolecular coupling …
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Monometallic and multimetallic complexes as precatalysts in the hydroformylation of olefins
… evaluated as catalyst precursors in the hydroformylation of higher olefins. The reaction conditions were optimised using the mononuclear precatalyst at 85 ℃, 40 bar syngas pressure for 4 h with 2.87 x 10-3 mmol Rh loading and a substrate (1-octene) to catalyst ratio of 2500 : 1. These …
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Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts
In industry, the hydroformylation reaction is predominantly homogeneously catalysed using carbonyl complexes of cobalt and rhodium (1-3,45). The main disadvantage of homogeneous catalysts is that, especially for the longer chain hydrocarbon systems, very energy-intensive methods (such as …
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Hydroformylation of olefins by water soluble and asymmetric cobalt and platinum complexes
Hydroformylation of olefins (OXO synthesis), one of the oldest organometallic catalytic reactions, continues to be of interest because of its commercial significance. Great interest recently has been placed on the development of immobilized homogeneous catalysts that combine the virtues of …
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Synthesis, characterization and evaluation of flourocarbon containing rhodium complexes for biphasic hydroformylation reactions
The synthesis and characterization of fluorocarbon-containing salicylaldimine and iminophosphine ligands and their Rh(I) complexes is described. These ligands were obtained via a Schiff base condensation reaction between 2-diphenylphosphinobenzaldehyde and salicylaldehyde with the appropriate …
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Hydroformylation of high temperature Fischer-Tropsch synthol products for the production of detergent alcohols
… products as an inexpensive and alternative hydroformylation feedstock for producing Oxo alcohols has been investigated. These alcohols are precursors for biodegradable detergents. The HTF-T product targeted as a feedstock source was Synthol Light Oil (SLO), in the C₈ to C₁₂ range. The aim of …
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Design, Synthesis and Catalytic Evaluation of Mono- and Polynuclear Organometallic Materials as Hydroformylation Catalysts
The hydroformylation reaction is an important homogeneous rhodium-catalyzed industrial process for the production of linear and branched aldehydes from readily available alkenes. The aldehydes produced serve as major building blocks for valuable chemical and pharmaceutical products. The …
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Heteroleptic dirhodium (II,II) complexes: synthesis, spectroscopy and applications in hydroformylation and hydroaminomethylation catalytic reactions
… obtained were used as pre-catalysts for the hydroformylation and hydroaminomethylation of olefins, an unprecedented homogenous catalysis system.
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Coupling electrochemical CO2 reduction with hydroformylation reactions in Ionic Liquid-based electrolytes: Feasibility and Stability assessment
L'abstract è presente nell'allegato / the abstract is in the attachment
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Synthesis and characterization of poly(proyleneimine)-based Rhodium(I) Metallodendrimers and their evaluation as Hydroformylation catalysts
… complexes were evaluated as catalysts in the hydroformylation of 1-octene. The complexes showed moderate hydroformylation rates under mild conditions. The multinuclear metallodendritic rhodium(I) complexes compare favorably to that of the mononuclear rhodium(I) complexes showing slightly …
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Use of water-soluble phosphine ligands in heterogeneous hydroformylation catalysis : application to long-chain 1-alkenes
… (Rh-TPPTS) system for the hydroformylation of 1-octene, 1-decene, and 1-dodecene to the corresponding aldehydes, has been investigated. Due to the two distinct phases - the catalytic species in the aqueous phase and the products and reactants in the organic phase - the …
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Synthesis, Structure, and Catalytic Activity of Bimetallic Rhodium Complexes in the Hydroformylation and Allylic Oxidation of Alkenes
… evaluated as possible catalyst precursors in the hydroformylation of 1-octene, optimized at 85 oC and 30 bar of syngas (1:1 H2/CO). Facile and quantitative conversions were obtained within 4 hours under these conditions. All complexes have near quantitative conversion, with complete conversion for …
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Alkylated PTA platforms for mono- and polynuclear pre-catalysts for the aqueous biphasic hydroformylation of 1-octene
… 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 branched) and …
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Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts
… complexes were inactive in the aqueous biphasic hydroformylation experiments. Hydroformylation using the heterobimetallic complexes showed that the pre-catalysts are active in 1-octene conversion, yielding aldehydes (linear and branched) as well as isomerisation products (cis and trans 2- and …
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Water Soluble Phosphines, Their Transitional Metal Complexes, and Catalysts
… achieved industrial-scale importance in olefin hydroformylation. Two-phase reactions have a number of advantages, for example, ease of separation of catalyst and product, catalysts can be tailored to the particular problem, use of special properties and effects of water as a solvent, and low …
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