Pyrrole studies. Part 32. A novel ring-cleavage reaction of the pyridazine ring during the reaction of 6H-pyrrolo[3,4-d]pyridazines with dimethyl acetylenedicarboxylate von de la Figuera Gomez, Teresa Hernandez, Arques, Jos Sep lveda, Jones, R. Alan, Dawes, Helen M., Hursthouse, Michael B.

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