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ChemInform Abstract: Transformation of Alkynyl Sulfones into Alkynylphosphonates with Trialkyl Phosphites.

✍ Scribed by Yasutaka Yatsumonji; Akitoshi Ogata; Akira Tsubouchi; Takeshi Takeda


Publisher
John Wiley and Sons
Year
2008
Weight
23 KB
Volume
39
Category
Article
ISSN
0931-7597

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✦ Synopsis


Abstract

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Ring Transformation of 3-Halo-4-methoxycoumarins into Pyrazoles with Hydrazines. -Treatment of (I) with hydrazine at room temperature affords the pyrazoles (II). In the reaction of (I) with excess hydrazine and phenylhydrazine unexpected pyrazolinones (III) and (V), respectively, are obtained.