Journal ArticleDOI
Synthese und Eigenschaften der 4‐Chlor‐ und 4‐Brom‐2H‐chromene sowie der 3‐Brom‐2H‐chromene
Hans Hofmann,Gerhard Salbeck +1 more
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TLDR
In this paper, the authors present synthesis and properties of 4-Chloro and 4-Bromo-2H-chromenes and of 3-Halo 2Hchromenes.Abstract:
Durch Abspaltung von Bromwasserstoff entstehen aus den trans-3.4-Dihalogen-chromanen die entsprechenden 4-Halogen-2H-chromene 1–4. Die 3-Brom-2H-chromene 5 und 6 erhalt man durch Dehydratisierung der cis-3-Brom-4-hydroxy-chromane.
Synthesis and Properties of 4-Chloro- and 4-Bromo-2H-chromenes and of 3-Bromo-2H-chromenes
Dehydrobromination of trans-3,4-dihalochromans yields the 4-halo-2H-chromenes 1–4. Dehydration of cis-3-bromo-4-hydroxychromans leads to the 3-bromo-2H-chromenes 5 and 6.read more
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Journal ArticleDOI
Synthesis and reactivity of some 4-bromo- 2H-chromenes and 2H-thiochromenes
Christopher D. Gabbutt,David J Hartley,John D. Hepworth,B. Mark Heron,Magan Kanjia,M.Moshfiqur Rahman +5 more
TL;DR: A facile synthesis of 4-bromo-2H-chromenes and 2H-thiochromenes from the corresponding ketones and PBr3 is described in this paper.
Journal ArticleDOI
Thermische Umlagerungen von halogensubstituierten Aryl-propargyläthern†
TL;DR: In this paper, it is suggested that initially a [3s, 3s]-sigmatropic rearrangement of the aryl propargyl ethers to the 6-allenyl-6-halogeno-cyclohexa-2, 4-dien-1-ones occurs and that from these the isolated products are formed via radical pathways.
Journal ArticleDOI
A simple route for the synthesis of 4-chlorochromenes and chroman-4-ones
TL;DR: In this paper, a one-pot synthesis of 4-chlorochromenes and chroman-4-ones was achieved from γ-chloropropargyl aryl ethers proceeding through Claisen rearrangement, depending upon the solvent of choice.
Journal ArticleDOI
Thermal behaviour of aryl γ-haloprcpargyl ethers
TL;DR: In this article, a systematic study of the behavior of aryl γ-halopropargyl ethers under thermal condition was undertaken, and the results showed that the transformation of these compounds yielded a mixture of products including 4-bromochromenes and chroman-4-ones.
References
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Journal ArticleDOI
Stereochemie und Solvolyse einiger 3.4-disubstituierter Chromane
Hans Hofmann,Gerhard Salbeck +1 more
TL;DR: In this paper, a reduction of 3-bromachromanone-(4) and of 3bromo-2,6-dimethylchromanone(4) yields the trans-3,4-dihalogenochromans 8-11.
Journal ArticleDOI
Ringverengung von 1-Thio-chromanen zu Benzo[b]thiophenen
Hans Hofmann,G. Salbeck +1 more