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9. Synthesis of 4-phosphazenyl-2,3-dihydropyrrol-2-ones and 5-phosphazenyl-2-pyridones from β-[(N-acyl)phosphazenyl]enamines and dimethyl acetylenedicarboxylate Elvira Pelàez-Arango,Fernando López-Ortiz J. Chem. Soc. Perkin Trans. 1 1996 1481