(IUCr) Crystallography Journals Online

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Acta Cryst. (2003). E59, o285-o287 [ doi:10.1107/S1600536803002290 ]

5-Ethyl-6-oxo-4-thioxo-1,3,2-oxazaphospholidino[3,2-a][1,3,2]benzodiazaphosphorine

S.-L. Deng, R.-Y. Chen, X.-B. Leng and L.-H. Weng

Abstract: The title fused tricyclic phosphoroheterocycle, C₁₁H₁₃N₂O₂PS, was unexpectedly synthesized by the reaction of a multifunctional compound, 2-[N-(2'-hydroxy)ethyl]amino-N'-ethylbenzamide, with tris(diethylamino)phosphine in the presence of iodine as catalyst. The crystallographic data analysis reveals that the title compound is triclinic with space group P $\overline 1$ and there are three rings in the molecule. The phenyl ring, the two N atoms and the carbonyl C atom are coplanar; the P atom and the carbonyl C atom deviate by -0.692 (2) and 0.1116 (13) Å, respectively, from the phenyl ring plane. The five-membered ring exists in an boat conformation.

Online 7 February 2003