Substituted calix[n]arenes. Synthesis ofp-isopropylcalix[4]arene and the structure of its benzene clathrate

p-Isopropylcalix[4]arens was synthesized by alkylation of unsubstituted calix[4]arene in the presence of ferric chloride hexahydrate. The structure of the compound and its benzene clathrate was established by NMR spectroscopy and X-ray diffraction analysis. Tashkent State University. A. S. Sadykov Institute of Bioorganic Chemistry, Academy of Sciences, Uzbekistan. Translated fromZhurnal Strukturnoi Khimii, Vol. 37, No. 3, pp. 539–543, May–June, 1996.