266 t?o. 4 trans-and cis-olefin proportions. Therefore, we have now investigated the effect of dicyclohexyl-18-crown-6-ether (N)'\*l\* on the trans-and cis-olefin composition in reaction of the bromide I (X-Br) and the tosylate I (X=OTs) with potassium tert-butoxide in three very different sohrents
✦ LIBER ✦
Constitutional effects on the competing syn- and anti-pathways in bimolecular elimination: Comments on the brown-ingold controversy
✍ Scribed by M. Pánková; J. Závada
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- French
- Weight
- 327 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
✦ Synopsis
The question whether steric3 or polar 4 effects control the course of E2 reactions in open-chain systems was discussed ardently during past decades and opposing views (Brown-Ingold controversy) remained irreconciled5. Our discovery that E2 reactions do not always proceed homogeneously by the anti-mechanism, as it was originally anti-NO. 24
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