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.
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Ko et al. (1984) studied this question.
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