Download Advances in Organometallic Chemistry, Vol. 17: Catalysis and by F.G.A. Stone, Robert West (Eds.) PDF
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
A = % n-hexanal of total aldehydes formed: B and C = % 2-methylpentanal and 2-ethylbutanal. respectively. linear isomer. However, later work suggests that these results may have been artifacts caused by high reaction rates. Both high temperatures and high catalyst concentration increase the rate of aldehyde formation and probably caused a depletion in dissolved carbon monoxide. This would have the same apparent effect as a lower partial pressure of carbon monoxide. Pino et a l . 6%. They also found that, provided the reaction rate was controlled by varying the concentration of olefin and of catalyst, the product composition varied only slightly as a function of either temperature or catalyst concentration.
8. Effect of the partial pressure of carbon monoxide on normal to isoaldehyde ratio and conversion to propane. p. I I ? (1970). Copyright by Gulf Publishing Company. Solvents were shown to have a marked effect upon the rate of reaction and in some cases to alter the product distribution. Without excess triphenylphosphine, as the polarity and concomitant basicity of the solvent increased, the selectivity of the catalyst also increased. Addition of excess triphenylphosphine to the polar solvent dimethylformamide resulted in a further increase in selectivity as well as a fourfold acceleration in rate.
5%. In the alcohol solvent, the aldehydes were converted to the corresponding acetals. A portion of the n-aldehyde was converted to 2,5-diethoxytetrahydrofuranby acid catalysis, and the isoaldehyde was thermally decomposed to 2-methyl-3-acetoxyacrolein. Finally, cobalt hydroformylation of acrolein diacetate in ethanol, in the presence of excess ethyl orthoformate, simplified the reaction and resulted in high yields of l,l-diacetoxy-4,4-diethoxybutane(n-isomer), (iso). The lower yields of l,l-diacetoxy-2-methyl-3,3-diethoxypropane favorable effects of ethyl orthoformate are shown in Table XXVII.