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Communication | Regular issue | Vol 34, No. 9, 1992, pp.1707-1710
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6110
Cycloaddition Reaction of 4-Oxo-4H-pyrazole 1,2-Dioxides with Epoxynaphthalene. X-Ray Analysis of the Cycloadduct and Some Comments on Cycloaddition Behavior

Kazunobu Harano, Yasuyuki Yoshitake, Masashi Eto, and Takuzo Hisano*

*Faculty of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-hon-machi, Kumamoto 862, Japan


The crystal structure of the cycloadduct of 2,5-bis(methoxycarbonyl)-4-exo-4H-pyrazole 1,2-dioxide with epoxynaphthalene was elucidated. The result indicates that the cycloadduct resulted from the direct 1,3-dipolar cycloaddition.