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ChemInform Abstract The diaryl ketone hydrazones (I) are converted to the quaternary hydrazonium salts (III) and (VII). The tetrafluoroborate (III) is demethylated with sodium cyanide or azide (IV), reproducing (Ia). The iodides (VII) are cleaved upon treatment with the Grignard compounds (VIII), yielding the benzophenones (IX) and N-methylpiperidine (X), together with some by-products which indicate radicalic intermediates. (Mechanism, quenching experiments with D2O).