By F.G.A. Stone, Robert West (Eds.)
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Extra resources for Advances in Organometallic Chemistry, Vol. 17: Catalysis and Organic Syntheses
31). The branched-chain alkylrhodium carbonyl was pictured as being formed first. This could then be hydrogenated immediately to the a-isomer (ll),or isomerized and then hydrogenated to the p-isomer (12). Higher temperatures promote the isomerization and cause the percentage of a-carboethoxypropionaldehyde to decrease. Higher pressures of carbon monoxide inhibit the isomerization and result in increased percentages of the a-isomer. High pressures of hydrogen favor the hydrogenation and would thus tend to promote hydrogenation of the initially formed branched-chain intermediate before isomerization could occur.
Prod. Res. 8,291 (1969). Copyright by the American Chemical Society. 2-Methylhexanal. 2-Ethylpentanal. Percent of total aldehyde which is I-heptanal. Hydroformylation 31 TABLE XIX EFFECTOF EXCESSLICAND UPON PRODUCT DISTRIBUTION FROM INTERNAL OLE FIN^ (64) Isomer distribution in product Olefin 2-Hexene 2,3-Hexene mix I-Hexene 2-Hexene 2-Hexene 2-Hexene Olefin conversion [PPh,]"excess" fM ) Temp. 3 40. 5 34. 3 x solvent, 75 ml dioctyl phthalate; olefin. 25 ml. Table reprinted with permission from Ind.
In addition. , phosphine) to the support. The objective has been to optimize and retain the positive benefits of the heterogeneous system without losing the intrinsic benefits of greater activity and selectivity of homogeneous catalysis. Although many interesting and useful results have been obtained, it is not indicated at this point in time that complete success has been accomplished. Among the earliest studies was that of Moffat (105). Poly-2-vinylpyridine, cross-linked with 4-8% divinylbenzene, was used as the coordinating support.
Advances in Organometallic Chemistry, Vol. 17: Catalysis and Organic Syntheses by F.G.A. Stone, Robert West (Eds.)