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Abstract α‐Hydrazinoalkylphosphonate 3 is a useful building block for the syntheses of novel N‐phosphonoalkylheterocycles. N‐phosphonoalkylpyrazoles 8 and 9 were prepared by the cyclization reaction of 3 with multifunctioned ethenes 5 and 6 in ethanol under reflux. N‐Phosphonoalkyltriazole 10 was synthesized from 3 with N‐dimethylthiomethylene benzoyl amide 4 in ethanol under reflux. The structures were confirmed by IR, 1H NMR, mass spectroscopy, and elemental analysis. At the same time, the preparation of 4 was investigated.
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Li et al. (2003) studied this question.
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