Metallated N-acyl-λ5-phosphazenes react with aryl cyanide to give imino-λ5-phosphazenes (6) and (7), in which nitrite insertion into the phosphorus–carbon bond of N-acyl-λ5-phosphazenes (2) and (3) takes place. Subsequent reactions of the imino- and enamino-N-ethoxycarbonyl-λ5-phosphazenes (7) and (9) afford the phosphine oxide derivatives (13) and (11), through a cyclocondensation and hydrolysis sequence.
J. Barluenga, M. Ferrero, F. Lopez and F. Palacios, J. Chem. Soc., Perkin Trans. 1, 1989, 615 DOI: 10.1039/P19890000615
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