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Dibenzobarrelenes can be prepared by Diels-Alder reaction of anthracenes with 2,3-bis(methoxycarbonyl)-7-oxanorbornadiene followed by thermal cycloreversion in good yields; sterically-hindered 9,10-di...methylanthracene smoothly furnished a corresponding dimethyl derivative even in a better yield. In the same time, janusene derivatives were obtained as by-products by successive cycloaddition-cycloreversion processes under one-pot formation conditions.続きを見る
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