Improved Preparation of 5,6-Dialkoxy-1,1-dimethylindenes, Precocene Analogues Lacking the Pyranyl Oxygen Atom [1]
Open Access
- 1 December 1984
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 39 (12) , 1801-1805
- https://doi.org/10.1515/znb-1984-1230
Abstract
The use of methanesulfonic acid as solvent and catalyst in the cyclocondensation of 1,2-dialkoxybenzenes with 3-methylbut-2-enoyl chloride to afford indanones 3, thus allowing the preparation of indenes 4 with improved overall yields, is reported. Additionally, structure of dimeric compound 7 a, formed in high yield by thermal treatment of 4a has been determined by com bination of spectroscopic means and selective deuterations.Keywords
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