| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | bis((S)-4-(methylthio)-2-(3-phenylureido)butyl) 2,2'-(1,3-phenylenebis(oxy))diacetate | 1294004-76-4 | C34H42N4O8S2 | 698.861 |
Four new derivatives of p-t-butylcalix[4]arene containing two (1,3-distal) chiral unsymmetrical urea moieties at the lower rim were synthesised in four steps. Their anion recognition properties toward MeCO2−, H2PO4−, NO3−, I−, Br−, Cl− were assessed by UV-Vis titration spectroscopy. All the receptors showed the strongest recognition ability for MeCO2−, one of them having an association constant of 3139 M-1. 1H NMR studies of this receptor complex confirmed its tight binding of MeCO2−.