Chemische Berichte

Thiophene und Selenophene aus α??Propinyl??carbonyl??Verbindungen

KE Schulte, J Reisch, D Bergenthal

Index: Schulte,K.E. et al. Chemische Berichte, 1968 , vol. 101, p. 1540 - 1552

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Citation Number: 27

Abstract

Abstract Aus α-[Propin-(2)-yl]-β-ketoestern, α-[Propin-(2)-yl]-diketonen und 5-Oxo-alkinen-(1) entstehen in Gegenwart von H 2 S und HCl in Äthanol und Temp. unter 0 durch intramolekularen Ringschluß Thiophene (4); als Nebenreaktion kann auch Furanring- Bildung eintreten (2). In die Reaktion lassen sich auch die entsprechenden Ketimoniumsalze einsetzen (7–9 [RIGHTWARDS ARROW] 4a, 6, 10). Mit H 2 Se ...

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