**A thermal Intermolecular [2 + 2]‐Cycloaddition of an Allenyl‐Allyl‐Benzene; Synthesis of Allenylbenzenes __via__ Acid‐Catalyzed Dienol‐Benzene Rearrangement** A few years ago, it has been shown that the acid‐catalyzed dienol‐benzene rearrangement of 2‐propinyl‐substituted cyclohexadienols is a co
Dienol-Benzol-Umlagerung von Penta-2,4-dienyl-benzocyclohexadienolen
✍ Scribed by Hans Greuter; Hans-Jürgen Hansen; Hans Schmid
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- German
- Weight
- 813 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
1‐Hydroxy‐2‐methyl‐2‐(penta‐2,4‐dienyl)‐1,2‐dihydronaphthalene (2), on treatment with 0,75N H~2~SO~4~ in ether at 0°, underwent a [1__s__, 2__s__]‐sigmatropic rearrangement to give 2‐methyl‐1‐(penta‐2,4‐dienyl)‐naphthalene (5), cf. scheme 2. 2‐Hydroxy‐1‐methyl‐1‐(penta‐2,4‐dienyl)‐1,2‐dihydronaphthalene (4) under the same conditions gave 38% of the [1__s__, 2__s__]‐product 1‐methyl‐2‐(penta‐2,4‐dienyl)‐naphthalene (6), together with 26% 1‐methylnaphthalene, 21% 1‐methyl‐4‐(penta‐2,4‐dienyl)‐naphthalene (7) and 1% 1‐methyl‐5‐(penta‐2,4‐dienyl)‐naphthalene (8), cf. scheme 2. Most likely the latter two naphthalene derivatives at least are products of an intermolecular process.
📜 SIMILAR VOLUMES
## Abstract Irradiation of 5‐phenyl‐2,4‐pentadienaldehydes **1** and **2** leads to a rapid __cis__, __trans__‐isomerization of the 4,5‐double bond followed by formation of unsaturated ketenes **7** and **12**, respectively, through a [1.5]‐hydrogen shift. In the dark, ketenes **7** and **12** reve
## Abstract Bei der thermischen Umlagerung von [2‐Propenyl‐4,6‐dimethyl‐phenyl]‐allyl‐[γ‐^14^C]‐äther entst and ein 2‐[P‐Methyl‐penta‐α, δ‐dienyl]‐4,6‐dimethyl‐phenol, in welchem 84% der Radioaktivität im α‐ und 16% im γ‐C‐Atom der Pentadienyl‐Seitenkette lokalisiert waren. Das Resultat eines Kreuz