Cyclooctadecanonaene | |
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Identifiers | |
CAS number | 2040-73-5 |
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Properties | |
Molecular formula | C18H18 |
Molar mass | 234.34 g mol−1 |
(verify) (what is: / ?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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Infobox references |
Cyclooctadecanonaene or [18]annulene is an annulene with chemical formula C18H18. This hydrocarbon obeys Hückel's rule and is, therefore, an aromatic compound. The compound was first synthesised by Franz Sondheimer.[1]
The original synthesis started by the Eglinton reaction of the di-alkyne 1,5-hexadiyne with copper(II) acetate in pyridine to give the trimer, followed by deprotonation and isomerization with potassium tert-butoxide in tert-butanol and was concluded with hydrogen organic reduction with the Lindlar catalyst.[2] [3]