Strahlenchemie von alkoholen XV

Abstract

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