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.