Novel urea-linked cinchona-calixarene hybrid-type receptors for efficient chromatographic enantiomer separation of carbamate-protected cyclic amino acids

Preparation and Characterization of Bonded-Phases of Calixarene-Sulfonyl-Carboxamides in Partial-Cone Conformation for Determination of Salbutamol in Livestock by Nano-Mediated Bonded-Phases: Nano-Baskets of Calixarene in Partial-Cone Conformation

“…The resulting solution was filtered through 0.22 μm filter and the filtrate (10 μL) was ready for analysis. p-tert-butyl-calix [8]arene steroids [25] calix [6]arene-p-sulfonate nitrophenol, methoxyphenol, cresol, aminophenol and chlorophenol [26] C-tetraundecylcalix [4]resorcinarene cytosine, uracil and thymine [27] calix [8]arene tricyclic neuroleptic [28] calix [4]arenes benzene or uracil derivatives [29] caltrex BIIE paracetamol, caffeine and acetylsalicylic acid [30] caltrex AIII celecoxib [31] fluorinated calix [4]arene fluorine compounds [32] p-tert-butyl-calix [8]arene aromatic carboxylic acids [33] 9-amino(9-deoxy)-epiquinine calix [4]arene, 9-amino(9-deoxy)-quinine calix [4]arene cyclic amino acids [34] caltrex AI, caltrex AII, caltrex AIII, caltrex BI, caltrex BII and caltrex BIII PAHs, phenols, substituted aromatics, xanthines, barbituric acid, benzoic acid esters [35] calix [4]arene tetradiethylamide amino acid ester hydrochlorides [36,37] calix [4]resorcinarene and calix [4,6,8]arene flupentixol, chlorprothixene, clopenthixol, and doxepin [38] p-tert-butylcalix [4,6,8]arene disubstituted aromatics, uracil derivatives, and estradiol epimers [39] p-tert-butylcalix [4,6,8]arene peptide bond isomers of proline [40] p-tert-butyl-calix [4]arene nucleosides, PAHs and bases [41] calix [6]<...>…”

The synthesis and characterization of novel brush-type chiral stationary phase based on terpenoid selector for resolution of chiral drugs

“…Since introduction to the area of chiral separation, the chiral selectors obtained from the natural chiral pool, such as alkaloids [7][8][9][10], sterols [11][12][13], terpenoids [14], and tartaric acid derivatives [15], have proved their usefulness and value in HPLC, which are used as the chiral molecular recognition site of brush-type CSPs. As a new class of adsorbents, brush-type CSPs can be easily and selectively modified allowing a prompt evaluation of the structural changes on the adsorption process.…”

1,3‐Alternate calix[4]arene‐bonded silica stationary phases. Effect of calixarene skeleton substituents on the retention mechanism and column selectivity

“…The modifications to these macrocycles include conformations in which the calixarene molecules are blocked, the type of functional groups and substituents present at their upper and lower rims, the calixarene ring-size, and the type of spacer fixing the macrocycles to the solid support. Calix[n]arenes [n = 4,6,8] in the cone conformation functionalized at the upper rim by tert-butyl [4,5] or other substituents [6], including chiral residues [7,8], have attracted great attention. However, some examples of calix [4]arenes in 1,3-alternate conformations have also been successfully used as selectors in RP-HPLC separations [9 -11].…”