**Synthesis of (±)‐α‐Chamigrene** __Cis__‐ and __trans__‐β‐ionol (__cis__ and __trans__‐**1**) underwent acid catalysed dehydration to a mixture of the tetraenes **2–5** in 70–80% yield (Table 1). Irradiation of this mixtures made the 6‐(__Z__), 8‐(__Z__)‐isomer **5** accessible (columns 3 and 4 in
Nickel-katalysierte Synthese von α-Nornicotin-Derivaten. Vorläufige Mitteilung
✍ Scribed by Heinz Peter; Dieter Reinehr
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- German
- Weight
- 144 KB
- Volume
- 61
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Nickel‐catalysed Synthesis of α‐Nornicotines
Schiff's bases 1 and butadiene generally co‐oligomerize on nickel catalysts to yield octatrienyl‐substituted amines 2 and octadienyl‐substituted imines 3.
Schiff's bases 4 and 5, on the other hand, react with 1, 3‐dienes to give new [3+2]‐cycloadducts 6. In addition to the appropriately functionalized α‐nornicotine derivatives some higher oligomers are formed.
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