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- W2026711036 abstract "Spezielle cyclische und offenkettige Carbonylverbindungen liefern bei der Umsetzung mit N.N′-Dimethyl-hydrazin über die entsprechenden Bis-en-hydrazine 3 als Zwischenstufen bei Säurekatalyse oder Thermolyse N-Methyl-pyrrole. Desgleichen führt die Umsetzung mit Monomethylhydrazin selektiv zu N-Methyl-pyrrolen. Infolge einer Konkurrenzreaktion werden gegebenenfalls Pyrazoline gebildet. Das Pyrazolin-System kann dabei, falls β-Eliminierung möglich ist, in das Pyrazol- bzw. Pyrazolium-System umgewandelt werden. — Die Mechanismen der Reaktionen werden diskutiert. Synthesis of Pyrroles, Pyrazolines and Pyrazoles via Bis-en-hydrazines Special cyclic and open-chain carbonyl compounds react with N.N′-dimethyl-hydrazine to bis-en-hydrazines 3 as intermediates which by thermolysis or acid catalysis give rise to the formation of N-methyl-pyrroles. Monomethylhydrazine gives in this reaction the same N-methyl-pyrroles, selectively. If the cyclization leads to pyrazolines, then the presence of a suitable leaving group effects the formation of the pyrazole or pyrazolium system by β-elimination. — The mechanisms of the reactions are discussed." @default.
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- W2026711036 date "1971-03-16" @default.
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- W2026711036 title "Synthese von Pyrrolen, Pyrazolinen und Pyrazolen über Bis-en-hydrazine" @default.
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- W2026711036 doi "https://doi.org/10.1002/jlac.19717440111" @default.
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