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In dilute aqueous solution Diethyl maleate (cas 141-05-9) (DEM) and diethyl fumarate (DEF) scavenge hydrated electrons with a rate constant of 2.2 10 1 0 mol - 1 dm 3 s - 1 . DEM - reversibly protonates with pK a = 5.2. The pK a of DEF - is below 4. The electron adducts decay in second order reactions. The OH radicals add to the double bonds with 5.9 10 9 mol - 1 dm 3 s - 1 . In the reaction α-carboxyalkyl radicals are produced. In disproportionation of radicals oxalacetic acid ethylester forms that in alkaline solution leads to strong permanent absorbency in the UV.
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