1,3‐Dipolar cycle‐addition of 2‐diazoalkanes to pyridazin‐3(2H)‐one derivatives. The formation of 3H‐pyrazolo[3,4‐d]pyridazin‐4(5H)‐one and 3H‐pyrazolo[3,4‐d]pyridazin‐7(6H)‐one derivatives

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