Summary
A high performance liquid chromatographic procedure on 5 μm RP-18 was developed for the separation of the four possible cis-trans isomers of tetramethyl-calix[4]arenoctol, and of their octaacetates, and their octamethyl ethers.
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Mann, G., Tittelbach-Helmrich, V., Lippmann, T. et al. Separation of stereoisomers of tetramethylcalix[4]arenoctol and derivatives by high-performance liquid chromatography. Chromatographia 34, 453–456 (1992). https://doi.org/10.1007/BF02290235
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DOI: https://doi.org/10.1007/BF02290235