19F-19F Coupling constants in the azole series. Synthesis of 3,4-, 4,5-, and 3,5-difluoropyrazoles期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

19F-19F Coupling constants in the azole series. Synthesis of 3,4-, 4,5-, and 3,5-difluoropyrazoles

Authors:	Francesc Fabra Empar Fos Jaume Vilarrasa

Affiliation:	Departamento de Química Orgánica, Facultad de Química, Barcelona-28 Spain

Abstract:	Stepwise syntheses of difluoroazoles $1$ , $2$ , and $3$ have been performed. The J_FF coupling constants are reported for the first time. Surprisingly, no coupling between F₄ and F₅ is observed.

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