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The addition reaction of carbon monoxide with ethyl iodide in aqueous hydroiodic acid was investigated under high pressure in the range of 30 to 90kg/cm2. The yield of propionic acid was fairly high and the rate of formation was the first order reaction with respect to carbon monoxide and ethyl iodide. The overall activation energy has been found to be 13.0kcal/mole, which contains the molar enthalpy change of equilibrium reaction (2), i. e., the heat of dissociation of C2H5I and the activation energy of reaction (3), i. e., the reaction between the ethyl cation and carbon monoxide.

Studies on the Kinetics of Addition Reactions of Carbon Monoxide with Organic Compounds in Hydroiodic Acid under High Pressure (Part 1)