1 -Phenyl-2-acetoxy-2-methyl-propanone-1 (111) and 1 -phenyl-2-methoxy-2-methylpropanone-1 (IV) were irradiated at room temperature with 15 or 25 ns flashes of 265 nm or 347 nm light in Ar-saturated cyclohexane or benzene solution. Transient absorptions and emissions were recorded as a function of time between 300 and 550 ZusammengefaBt ergibt sich: Die hohe Hartungseffektivitat von I und I1 folgt aus der hohen Ausbeute und der hohen Geschwindigkeit der a-Spaltung. Ill und IV zeigen diese Reaktion nicht und starten daher keine Hartung. Die Hilrtungsfahigkeit von 111 und 1V in Gegenwart eines Coinitiators beruht auf der Bildung von Ketylradikalen uber einen Wasserstofftransfermechanismus.
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