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Synthesis of hydrazonoyl chlorides 4 and base-induced generation of nitrile imines 5. Reaction conditions: (i) Benzoyl chloride 1 (1 equiv), arylhydrazine 2 (1.1 equiv), pyridine (2,2 equiv), THF, 0–5 °C, 2 h; (ii) acylhydrazine 3 (1 equiv), triphenylphosphine (1.25 equiv), carbon tetrachloride (1.25 equiv), CH3CN in an inert atmosphere at room temperature overnight.
