Structure of 16-Hydroxyisosteviol-Derived Dicarboxylic Acid Esters

摘要

Dielcometry,method of dipole moments,IR spectroscopy,and computer simulation were used to show that dicarboxylic acid esters derived from 16-hydroxyisosteviol(ent-16-hydroxybeyeran-19-oic acid)exist in CCl4 solutions as tweezer-like or open-chain structures,or dimers with various steric structures,depending on the degree of dilution.Concentrations at which both the esters and parent dicarboxylic acids undergo structural rearrangement were established.The structure of three esters was confirmed by X-ray diffraction.