## Abstract Two representative cases of the [2, 3] sigmatropic rearrangement are described, and the mechanism of this reaction is discussed.
On the [1,4] sigmatropic rearrangement of ammonium benzylides
✍ Scribed by Tadeusz Zdrojewski; Andrzej Jończyk
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- French
- Weight
- 167 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0040-4039
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An investigation of the Lewis acid mediated [2,3]-sigmatropic rearrangement of allylic ammonium ylides has been conducted by employing various bases and boron Lewis acids. Using BBr 3 together with the phosphazene base 6, various allylic amines could be rearranged in good yields with low to excellen
Stereochemical studies on the oxyanion-accelerated [1,3]-sigmatropic rearrangement reactions of nonracemic cis-and trans-2-(1-cyclohexenyl)cyclobutanols are described. Epimerization of cis-2-(1-cyclohexenyl)cyclobutanol to the trans-isomer at -20°C was found to proceed with predominant retention of