A simple method for the synthesis of 4-{[(dimethyl)azanylidenonium chloride] methyl}amino-2,3-dihydro- 3-oxo-4H-1,2,4,3-triazaphosphole (2) is described. Treatment of phosphonic dihydrazide (1) with Vilsmeier-Haack reagent led directly to the title compound in high yield.
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Ali et al. (2013) studied this question.
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