The synthesis and biological studies of cyclophosphamides and structurally related analogs are of both practical relevance and academic interest. These compounds are studied in different areas of chemistry: cholinesterase and urease inhibitors, insecticides and pestisides, efficient ligands in coordination chemistry, ashless antioxidants, antirust and antiwear additives for lubricating oil, synthetic purposes, and structural study. [1] [2] [3] [4] Although cyclophosphamides have been the

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... of intensive studies for more than a century, considerably less attention has been devoted to diazaphospholidine derivatives. 5 A thorough knowledge of the crystal properties of these compounds should be beneficial to a detailed understanding of the effect of structure on pharmacological effects. The crystal structure of novel diazaphospholidines (1), is reported here.