Tetrahedron Letters p. 2689 - 2692 (1987)
Update date:2022-07-31
Topics:
Eberbach, Wolfgang
Roser, Joachim
A remarkable substituent effect is described for the thermal transformation of three butenynyl nitrones into pyrrole and pyridine derivatives.The results are best explained by assuming oxaza-cycloallenes, cyclopropenes, and, most importantly, carbonyl carbenes as intermediates.
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