Tetralones can be synthesised by oxidation of phenylalkylideneamino-oxyacetic acids with persulphate. The iminyls formed initially abstract a y-hydrogen from the alkyl chain and the resulting carbon radicals then cyclise onto the benzene ring. The same iminyls, when generated in benzene solution by thermolysis of imino-oxyperacetates, do not abstract y-hydrogen unless trifluoroacetic acid is present. Hence, the hydrogen abstracting species in both cases is thought to be the protonated iminyl (RArC=NH).

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