Ring Expansion of Heterocyclic KeteneN,X
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Quast, Helmut ;Ivanova, Svetlana ;Peters, Eva-Maria ;Peters, Karl ;Schnering, Ha
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Article
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1996
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John Wiley and Sons
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English
⚖ 807 KB
## Abstract Methanesulphonyl azide (2) reacts readily with isolated cyclic ketene __N,X__‐acetals of type 1, viz. 10a, d, 15b, d, and 22a–c, or those that are generated in situ by deprotonation of the corresponding 2‐alkylbenzazolium tetrafluoroborates, i.e. 14a → 15a, 14b → 15b, and 18 → 19. Ring‐