A series of compounds in which a part or all of the methylene bridges of acyclic p-methyl- and pt-butylphenol–formaldehyde tetramers were replaced by sulfur bridge (s) was synthesized. It was found that though the sulfur-bridged tetramers formed crystalline host- guest complexes with a variety of organic compounds, they were different from the parent tetramers regarding their inclusion behavior. The number and position of the sulfur bridge ...