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Zur Kenntnis der Indolreaktion nach Fischer, I. Thermische und Säurekatalysierte Reaktionen von N, N′-Dimethyl-N-phenyl-N′-alkenylhydrazinen

✍ Scribed by Peter Schiess; Alfred Grieder


Publisher
John Wiley and Sons
Year
1974
Tongue
German
Weight
881 KB
Volume
57
Category
Article
ISSN
0018-019X

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✦ Synopsis


N,N′‐dimethyl‐N‐phenyl‐N′‐alkenylhydrazines 9a–9f (Scheme 2) have been prepared by three different routes. These compounds yield N‐methyl‐indols 14a–14f (Scheme 3) upon thermolysis at 110° or upon treatment with dilute acid in anhydrous solvents at room temperature. The rate of the acid catalysed reaction varies by several orders of magnitude within the range of the examples studied. The observed structure‐reactivity relationship can be rationalized as reflecting the different tendency of the alkenylhydrazines 9a–9f for protonation on carbon vs. protonation on nitrogen (Scheme 4), the nitrogen protonated tautomer undergoing a rapid charge induced [3,3]‐sigmatropic rearrangement leading ultimately to indol.


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Zur Kenntnis der Indolreaktion nach Fisc
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