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Production d'un faisceau de 14C négatif à partir de carbures de tantale

✍ Scribed by Michèle Dumail

Publisher
Elsevier Science
Year
1979
Weight
311 KB
Volume
163
Category
Article
ISSN
0029-554X

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✍ J. M. J. Tronchet; A. Jotterand 📂 Article 📅 1971 🏛 John Wiley and Sons 🌐 German ⚖ 874 KB

## Abstract The reaction of an __aldehydo__‐sugar hydrazonoyl bromide with ethynylmagnesium bromide led mainly to an α‐ethynyl‐hydrazone whose cyclisation to a pyrazole is catalysed by bases. Thus the nucleophilic substitution – nucleophilic cyclisation mechanism of the __Grünanger__pyrazole synthe