Δ1‐pyrazolines: (Pyrazol and pyrazoline derivatives II
作者： J. van Alphen
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摘要: Δ1-pyrazolines, in which the double bond is situated between two nitrogen atoms can be prepared by addition of diphenyldiazomethane to diphenyl ester citraconic acid and trimethyl aconitic acid. These compounds split off at higher temperatures forming cyclopropane derivatives. Diphenyl diazomethane combines directly with anhydride, splitting nitrogen.
sci-hub.se 参考文章(2)
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H. v. Pechmann, E. Burkard, Ueber die Anlagerung von Diazomethan an Citraconsäure und Mesaconsäure Berichte der deutschen chemischen Gesellschaft. ,vol. 33, pp. 3597- 3598 ,(1900) , 10.1002/CBER.190003303165