Pineda-Castañeda H, Maldonado M, Rivera-Monroy ZJ. Efficient Separation of C-Tetramethylcalix[4]resorcinarene Conformers by Means of Reversed-Phase Solid-Phase Extraction.
ACS OMEGA 2023;
8:231-237. [PMID:
36643487 PMCID:
PMC9835186 DOI:
10.1021/acsomega.2c03218]
[Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 08/11/2022] [Indexed: 05/13/2023]
Abstract
A reversed-phase high-performance liquid chromatography (RP-HPLC) method was developed to study the conformer formation generated during the reaction for obtaining C-tetramethylcalix[4]resorcinarene. The chromatographic method was used to design a strategy for purifying the reaction products, using solid-phase extraction columns (RP-SPE) and gradient elution. The chromatographic profiles of the cyclocondensation reaction between resorcinol and acetaldehyde show the presence of three products under the different reaction and precipitation conditions studied. Using RP-SPE, it was possible to enrich the products, which were later characterized by means of RP-HPLC and 1H nuclear magnetic resonance (NMR). This investigation explored and established a new method for RP-HPLC analysis and RP-SPE separation of conformational isomers obtained in the formation reaction of C-tetramethylcalix[4]resorcinarene.
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