Catalysed gas phase decompositions. XXXI. 2,2-Dimethoxypropane and formic and propionic acids

Abstract

Formic and propionic acids catalyse the decomposition of 2,2- dimethoxypropane into isopropenyl methyl ether and methanol in homogeneous, molecular reactions at 274-334 and 335-389°C with rate constants:                    k₂ = 10^10.62exp(-94030/8.314T) s^-1 ml mol^-1                    k₂ = 10^12.44exp(-124240/8.314T) S^-1 ml mol^-1 respectively.    Carboxylic acids appear to be generally effective as catalysts, and with this substrate the rate order is:                         HBr > CF₃COOH > HCl >> HCOOH > CH₃COOH ≈ C₂H₅COOH