Bridging of Resorcin[4]arenes in the Chair Conformation to Cavitands Having Two Pairs of Axial and Equatorial Substituents

3-7 with bromochloromethane. According to X-ray analysis of cavitand 19 and 1-D and 2-D NMR spectroscopy for 18, the cavitands possess a stereochemistry with two adjacent aryl substituents in the axial position and the two others in the equatorial position. The starting methylresorcin-[4]arenes 3-7 were obtained exclusively in the chair conformation in 30-98% yield upon condensation of 2-methylresorcinol with aryl aldehydes.