Xanthenol Clathrates:  Structures and Solid−Solid Reactions

The structures of the host compound 9-(4-methoxyphenyl)-9H-xanthen-9-ol (<b>H</b>) and of its inclusion compounds with naphthalene, anthracene, phenanthrene, pyrene and β-naphthol have been elucidated. The inclusion compounds are isostructural with respect to the host positions, and all have stoichiometries of <b>H</b>·/<sub>2</sub>guest with the guest molecules located on a center of inversion. The inclusion compounds can be formed by solid−solid reactions, and the kinetics of the reactions with naphthalene and β-naphthol have half-lives of 44 and 31 min at room temperature, respectively.