freigesetzt wurden. Die Losung wurde darauf in Vakuum zur Trockne eingedampft. Den Riickstand erwarmte man rnit 50 ml Ather, kuhlte auf 0" und nutschte ab. Man erhielt 5,s g kristallinen Ruckstand. Nach 2maligem Umldsen aus Isopropanol Smp. 315" (Zcrs.); Reinausbeute 2 g. Gemass Misch-Smp., UV.-und
Neue Umlagerungen von Aryl-allyl-äthern und Allylphenolen. (Vorläufige Mitteilung)
✍ Scribed by J. Borgulya; H.-J. Hansen; R. Barner; H. Schmid
- Publisher
- John Wiley and Sons
- Year
- 1963
- Tongue
- German
- Weight
- 136 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
In position 3 (and 5) substituted phenyl‐γ‐methyl (and phenyl)‐allylethers when subjected to the thermal CLAISEN‐rearrangement not only yield the expected o‐allyl‐phenols but in addition considerable amounts of the P‐allylated phenols. Migration to the para‐position is favoured by non‐polar solvents. This para‐migration of the substituted allylgroup is attributed mainly to steric factors. With sterically hindered, in ortho‐ or para‐position allylated phenols there was furthermore found an allyl‐phenol‐rearrangement: on sufficient heating to 200° these substances are transformed to the thermodynamically more stable para‐ resp. ortho‐allylphenols with inversion of the allyl group.
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