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The recovered starting material [%] is given between brackets.
Additional oxidant was added after 1 day and stirring was continued for another day.
Reaction was performed on smaller scale (see Experimental Section).
Isolated yield of the corresponding 2,4-dinitrophenyl hydrazone 34a.
Conversion based on 1H NMR analysis of the crude mixture.
Total reaction time exceeded 48 h (see Experimental Section).
