E. Benedetti et al., STRUCTURE AND CONFORMATION OF STEREOISOMERIC C-ISOPROPOXYCARBONYLMETHYLCALIX[4]RESORCINARENES, Journal of chemical research. Synopses, (12), 1994, pp. 476-477
Treatment of (E)-2,4-dimethoxycinnamic acid isopropyl esters with boro
n trifluoride-diethyl ether in chloroform at room temperature affords
various stereoisomeric C-alkylcalix[4]resorcinarenes, which differ in
their conformations; the crystal structures of two stereoisomers have
been determined and compared with geometries resulting from theoretica
l calculations.