Abstract
A new phenomenon was observed for p-menthane-1,2,4-triol, i.e., the substance with the same molecular structure occurs in two forms with different polarity. The form with a lower polarity is eluted with ethyl acetate in column chromatography; the form with a higher polarity is eluted with methanol. The crystals isolated by ethyl acetate elution exhibit polymorphism; whereas no polymorphism was observed for the crystals isolated by methanol elution. The crystals isolated differed in melting temperature and optical rotation. The structure of p-menthane-1,2,4-triol was confirmed by two independent methods, i.e., by the single-crystal X-ray diffraction and NMR spectra.
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The financial support from the Slovak Research and Development Agency under the contract no. APVV-0202-10, and the Slovak Scientific Grant Agency (VEGA Projects 1/0617/15 and 1/0592/15) is greatly acknowledged.
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Fodran, P., Marko, A., Žemlička, L. et al. A new phenomenon of various polarity observed in p-menthane-1,2,4-triol. Monatsh Chem 146, 1283–1289 (2015). https://doi.org/10.1007/s00706-015-1455-2
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DOI: https://doi.org/10.1007/s00706-015-1455-2