**Reactions of Mesoionic s‐Triazolo[4,3‐b] pyridazines with Electrophilic Reagents** The redox‐properties of zwitterionic s‐triazolo [4, 3‐b]pyridazines **1–3** depend on the heteroatom: products with S‐atoms can easily be oxidated. O‐Zwitterions **1** and **2** react with diazoniumsalts under azoc
Allylumlagerung beiSN-Reaktionen von 4-(α-Chloralkyl)pyridazinen
✍ Scribed by Gottfried Heinisch; Richard Waglechner
- Publisher
- Springer Vienna
- Year
- 1984
- Tongue
- English
- Weight
- 641 KB
- Volume
- 115
- Category
- Article
- ISSN
- 0026-9247
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## Abstract The title compound **3** was isolated after pyrolysis of __cis/trans__‐**1** at 240°, respectively of __cis/trans__‐**8** at 156°. Thermolysis of __cis/trans__‐**8** at 111° resulted in the deconjugated product **9**, which subsequently could be rearranged __via__ a [1,7] H‐shift prefer
Wird die Hydroxylgruppe eines Ketoxims (I, X = OH) durch Protonierung, Veresterung oder Veratherung in eine aktive nucleofuge Gruppe verwandelt, so tritt in der Regel eine BECKMANN-Umlagerung ein3). Unter Wanderung der zu X transstandigen Gruppe R an das Stickstoffatom und anschliessender Anlagerung