Summary
Spectroscopic investigations in the UV region of the phenolcarboxylic acids that we have isolated from the leaves ofCynara scolymus have been carried out. It has been found that:
1. Free caffeic acid can be distinguished from its esters by the changes in the UV spectra under the influence of sodium ethoxide and sodium acetate.
2. An o-dihydroxy grouping in esters can be detected from the bathochromic shift observed with boric acid in the presence of sodium acetate.
3. An o-dihydroxy grouping can be detected both in esters and in the free acid under the influence of aluminum chloride.
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References
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Khimiya Prirodynkh Soedinenii, Vol. 2, No. 5, pp. 303–306, 1966
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Dranik, L.I. A spectroscopic investigation of the phenolcarboxylic acids ofCynara scolymus . Chem Nat Compd 2, 246–248 (1966). https://doi.org/10.1007/BF00566982
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DOI: https://doi.org/10.1007/BF00566982