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A New Synthesis of Fused Oxa- and Thiacrown Ethers–Thiophene/Furan Oligomers

✍ Scribed by Frédéric Garzino; Alain Méou; Pierre Brun

Publisher
John Wiley and Sons
Year
2011
Tongue
German
Weight
315 KB
Volume
94
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

We have developed a two‐step sequence for preparing a series of macrocyclic oxa‐ and thiacrown ethers affixed to a thiophene/furan oligomer. The sequence involves the intramolecular Mn^III^‐promoted cyclization of linear diester precursors into 2,3‐dihydrofurans, whose dehydrogenation furnishes the title compounds. A preliminary NMR study has shown that one of them seems to specifically chelate Pb^2+^ cations.

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Synthesis of some new benzofuran-based t
Synthesis of some new benzofuran-based thiophene, 1,3-oxathiole and 1,3,4-oxa(thia)diazole derivatives
✍ Kamal M. Dawood; Ahmad M. Farag; Hatem A. Abdel-Aziz 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 225 KB

## Abstract Treatment of 3‐(3‐methylbenzofuran‐2‐yl)‐3‐oxopropanenitrile (**1**) with phenyl isothiocyanate afforded the thioacetanilide derivative **3**, which when reacted with α‐haloketones, α‐halodiketones, and hydrazonoyl chlorides gives thiophene, 1,3‐oxathiole, and 1,3,4‐thiadiazole derivati