The important role of solvent vapor in an organic solid state reaction.

Some organic reactions in the solid state proceeded very efficiently and selectively in the presence of a small amount of solvent vapor.

Isolation of an inclusion complex of naphthol and its benzoate as an intermediate in the solvent-free benzoylation reaction of naphthol.

Solvent-free benzoylation of naphthol was found to proceed via an inclusion complex intermediate of the naphthol and its benzoate by IR spectral monitoring.