Kinetics of Oxidation of Some Dihydroxy Ethers by Permanganate in Perchloric Acid Medium

摘要

Reactivities of some dihydroxy ethers, viz., diethylene glycol, triethylnee glycol, tetraethylene glycol, polyethylene glyocl (200, 400, 600 LR) by permanganate have been studied in presence of perchloric acid. The reaction rate increases with increase in [H~+] and the order with repect to [H~+] is 0.4+-0.1 at [H~+]<=0.4 mol dm~(-3) but 1.3+-0.1 at [H~+]>0.4 mol dm~(-3). The reaction occurs through the protonation of ether group of the substrate in a fast preequilibrium followed by a slow rate-determining oxidation step. The substrates are oxidised to give formalehyde. The reactions have been shown to occur by the one-step two-electron transfer process.