1,3-Dipolar cycloadditions of azides, p-chlorobenzonitrile oxide and methyl diazoacetate with 2,2-dimethylprophlidynylphosphine occur regiospecifically yielding cyclic ‘aromatic’ monoadducts: triaza-, oxaza-, and diaza- phospholes and the oxazaphosphole can react further with p-chlorobenzonitrile oxide to give a symmetrical [3.3.0]phosphorus heterocycle.
Y. Y. C. Y. L. Ko, R. Carrié, A. Muench and G. Becker, J. Chem. Soc., Chem. Commun., 1984, 1634 DOI: 10.1039/C39840001634
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