Synthesis and dichromate anion extraction ability of p-tert-butylcalix[4]arene diamide derivatives with different binding sites

Synthesis and evaluation of chromate and arsenate anions extraction ability of a N-methylglucamine derivative of calix[4]arene immobilized onto magnetic nanoparticles

“…In our previous study [27,40,41], we report the synthesis and extraction studies of polymers based on a calix [4]arene platform with cyclic amino groups on their upper rim. It was observed that the ionophores were very good adsorbents for dichromate from aqueous solution.…”

Removal of chromate and phosphate anion from aqueous solutions using calix[4]aren receptors containing proton switchable units

“…Nevertheless, since the periphery of the anions has oxide moieties, these are potential sites for hydrogen. The maximum permissible levels of Cr(VI) in potable and industrial wastewaters are 0.05 and 0.25 mg/L, respectively [12]. Due to its high solubility, Cr(VI) is very toxic to living organisms compared to Cr(III) [13].…”

Enantioselective hydrolysis of (R,S)-Naproxen methyl ester using Candida rugosa lipase with calix[4]arene derivatives

“…Compounds 1-4 were synthesized according to previously published procedures [17], whereas compounds 5 and 6 were synthesized according to the route shown in Scheme 1. Briefly, a solution of 1-(2-furoyl)piperazine or 1-(2-pyrimidyl)piperazine (21.76 mmol) in tetrahydrofuran (THF, 25 mL) was added to a solution of 25,27-bis(chlorocarbonylmethoxy)-26,28-hydroxycalix [4]arene (4) (6.2 g, 5.44 mmol) in THF (100 mL) in a drop-wise manner over 1 h with continuous stirring at room temperature, and the resulting mixture was stirred at the same temperature for 5 h. The solvent was then removed in vacuo to give a residue, which was dissolved in water (200 mL) and neutralized (pH 7) by the addition of 0.1 M HCl.…”

“…All of the newly synthesized compounds were characterized by 1 H and 13 C NMR, FT-IR and elemental analyses. Compounds 1-4 were synthesized according to previously published procedures [17]. Compounds 5 and 6 were synthesized from the corresponding acid chlorides.…”