Highly regio- and enantioselective thermal [2+2] cycloaddition of coumarin in a crystalline inclusion complex under high vacuum.
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Wen, Y. Q.; Song, Y. L.; Zhao, D. B.; Ding, K. L.; Bian, J.; Zhang, X.; Wang, J. X.; Liu, Y.; Jiang, L.; Zhu, D. B., Chem. Commun. 2005, (21), 2732-2734.
Coumarin and thiocoumarin, which are usually thermally unreactive for dimerization, were dimerized in their inclusion crystalline complexes under thermal and high vacuum conditions.