No abstract

Potassium hydrogensulfate (KHSO4), which melts at a lower temperature of 197 °C, was adapted for vapor-phase fixed-bed flow operations as a silica-supported potassium disulfate (K2S2O7/SiO2) to afford 60% ethyl pyruvate continuously from the tartrate at 300 °C. The catalyst was effective for the intramolecular dehydration of glycol moieties, much less active for hydrolysis of esters, and capable of converting enol- to keto-form for the intermediate oxalacetate in favor of pyruvate. A TGA analysis revealed that KHSO4 was converted to K2S2O7 at 300 °C, this was in consistent with the XRD analysis.

The reaction behavior of propylene oxide with boron trifluoride was affected remarkably by solvent. In dioxane, the isomerization to propionaldehyde proceeded smoothly and selectively, while the reaction behavior in heptane, benzene, and tetrahydrofuran was quite different from that in dioxane.

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