ChemInform Abstract: HYDROFORMYLATE PROPYLENE AT LOW PRESSURE

Fowler, R.; Connor, H.; Baehl, R. A.

doi:10.1002/chin.197701188

Cited by 4 publications

(3 citation statements)

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“…Hydroformylation is the most important and has been extensively studied and largely applied. ,,, Cobalt carbonyl is still the most widely used hydroformylation catalyst, while rhodium carbonyl complexes can also be used. , The hydroformylation reaction, or oxo process, could convert triglycerides or fatty acid esters into aldehydes in the presence of homogeneous Rh or Co catalysts. These catalysts generally favor isomerization reactions, and consequently different isomers are obtained.…”

Section: 23 Hydroformylationmentioning

confidence: 99%

Chemical Routes for the Transformation of Biomass into Chemicals

2007

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Section: 23 Hydroformylationmentioning

confidence: 99%

Chemical Routes for the Transformation of Biomass into Chemicals

2007

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“…Rhodium hydride complexes are intermediates in a variety of catalytic reactions . In general, rhodium complexes appear to be more reactive than their cobalt and iridium analogues, but the origin of this enhanced reactivity is not fully understood.…”

Section: Introductionmentioning

confidence: 99%

HRh(dppb)₂, a Powerful Hydride Donor

et al. 2002

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The Rh(I) and Rh(III) hydrides HRh(dppb)2 and [HRh(dppb)2(NCCH3)](BF4)2 (where dppb is 1,2-(bis(diphenylphosphino)benzene) have been prepared, and a structural study of [HRh(dppb)2(NCCH3)](BF4)2 has been completed. The latter complex is an octahedral complex with a trans arrangement of the hydride and acetonitrile ligands. A pK a value of 9.4 was measured for this complex by equilibration of [Rh(dppb)2](BF4) with 4-bromoanilinium tetrafluoroborate in acetonitrile. [Rh(dppb)2](BF4) reacts with H2 in the presence of Pt(dmpp)2, which acts as a base, to form HRh(dppb)2 and [HPt(dmpp)2](BF4) (where dmpp = 1,2-bis(dimethylphosphino)propane). An equilibrium constant of 0.42 ± 0.2 was measured for this reaction. Using this equilibrium measurement and a thermodynamic cycle, the hydride donor ability (ΔG°H-) of HRh(dppb)2 was determined to be 34 kcal/mol. This value indicates that HRh(diphosphine)2 complexes are powerful hydride donors. Similarly the pK a value of HRh(dppb)2 was calculated to be 35 from a thermodynamic cycle that included the potential of the Rh(I/−I) couple (E 1/2 = −2.02 V vs ferrocene). These results combined with results from the literature suggest the following order of hydricity for five-coordinate, 18-electron hydrides: second row > third row > first row. Similarly an acidity order of second row ≥ first row > third row is deduced.

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“…by the presence of acidic sites on the catalyst. 6. The presence of extrinsic catalyst poisons in the feed, such as sulphurcontaining compounds, halogen-containing compounds, oxygen, acetylenes and dienes.…”

Section: Bench-scale Process Studies and Process Designmentioning

confidence: 99%

Chemical and Technical Aspects of Hydroformylation of Olefins With Supported Liquid-Phase Rhodium Catalysts

Schölten

Hardeveld

1987

Chemical Engineering Communications

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Supported liquid-phase catalysts containing RhH(CO)(PPH,), dissolved in PPH, are used in the gas-phase hydroformylation of several olefins. Their activity in the hydroformylation of ethylene, propylene and the butenes is reported.Various physicochemical aspects of the rhodium SLP catalysts, such as the adsorptive withdrawal of the rhodium complexes by the supports, the activity of the rhodium complexes at the gas-liquid interface and the solubility of the reactants and products in the liquid part of the catalysts, are discussed.The results are presented of a bench-scale process study of the hydroformylation of propylene, from which the design parameters of a future plant are calculated.

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ChemInform Abstract: HYDROFORMYLATE PROPYLENE AT LOW PRESSURE

Abstract: Ein neues Niederdruckverfahren zur Darstellung von Butyraldehyd in Gegenwart eines Rhodiumkatalysators der zurück= ‐ gewonnen werden kann, wird beschrieben.

Cited by 4 publications

References 0 publications

Chemical Routes for the Transformation of Biomass into Chemicals

Chemical Routes for the Transformation of Biomass into Chemicals

HRh(dppb)₂, a Powerful Hydride Donor

Chemical and Technical Aspects of Hydroformylation of Olefins With Supported Liquid-Phase Rhodium Catalysts

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ChemInform Abstract: HYDROFORMYLATE PROPYLENE AT LOW PRESSURE

Abstract: Ein neues Niederdruckverfahren zur Darstellung von Butyraldehyd in Gegenwart eines Rhodiumkatalysators der zurück= ‐ gewonnen werden kann, wird beschrieben.

Cited by 4 publications

References 0 publications

Chemical Routes for the Transformation of Biomass into Chemicals

Chemical Routes for the Transformation of Biomass into Chemicals

HRh(dppb)2, a Powerful Hydride Donor

Chemical and Technical Aspects of Hydroformylation of Olefins With Supported Liquid-Phase Rhodium Catalysts

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Product

Resources

About

HRh(dppb)₂, a Powerful Hydride Donor