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β-Phosphonylhydrazone 1 are considered as reagents in heterocyclic synthesis (Pyrazoles phosphonated, Diazaphospholines oxides). In the present work, we study the reaction of hydrazones β-disubtituted phosphine oxide 1 with Lawesson reagent (L R) to lead to the 3-thioxo-1,2,3-diazaphospholines derivatives 2 . The structure of products 2 is confirmed by NMR and IR spectroscopy.
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