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Syntheses of mono-, di- and triethynylazulenes

✍ Scribed by Kai H.H Fabian; Ahmed H.M Elwahy; Klaus Hafner

Publisher
Elsevier Science
Year
2000
Tongue
French
Weight
101 KB
Volume
41
Category
Article
ISSN
0040-4039

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✦ Synopsis

Simple and productive routes to mono-, di-and triethynylazulenes are described. Azulenes ethynylated in the five-membered ring can be prepared on a multigram scale by Pd-catalyzed cross-coupling of iodo-or bromoazulenes with trimethylsilyl-acetylene and subsequent desilylation. 5,7-Diethynylazulene was synthesized by dibromomethylenation of the corresponding dialdehyde and subsequent dehydrobromination.

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