Strahlenchemie von alkoholen XV : γ-Radiolyse von Äthylenglykol in wäßriger Lösung

In the γ-radiolysis of aqueous N₂O-saturated solutions of ethylene glycol (0,1 M) the following products (G-values at 20°C) were found: succinaldehyde (1,7S), glycolaldehyde (1,0₅), acetaldehyde (1,2), 3,4-dihydroxybutanal (0,2₂), and erythritol (0,1₅). Radicals from the water radiolysis (H˙ and ˙OH) attack ethylene glycol and yield ˙CHOH -CH₂OH radicals. These radicals readily split off water yielding ˙CH₂- CHO radicals [reaction (3)]. All products can be explained by disproportionation or dimerization of these two radicals. Material balance of products formed with respect to the primary yields of ˙H and ˙OH radicals from water radiolysis was obtained.˙CHOH-CH₂OH -+ CHO-CH₂˙ +H₂O. (3)CHO-CH₂˙+CH₂OH-CH₂OH→CHO-CH₃+˙CHOH-CH₂OH. (9)In contrast to the yields of the other products the acetaldehyde yield depends strongly on ethylene glycol concentration and temperature. With increasing temperature and ethylene glycol concentration the chain (3) - (9) - (3) becomes more and more important