A modified [3+1] cyclization procedure for the synthesis of calix [4]arenes was developed by using diglycol dimethyl ether as the solvent in place of dioxane which was generally adopted in previous literature. By the ...A modified [3+1] cyclization procedure for the synthesis of calix [4]arenes was developed by using diglycol dimethyl ether as the solvent in place of dioxane which was generally adopted in previous literature. By the modified procedure, the yield of 5-bromo-11, 23-di-tert-butyl-17-methyl-25, 26, 27, 28-tetrahydroxycalix[4]arene from cyclic condensation of 2, 6-bis(2’-hydroxy-5’-tert-butyl-benzyl)-4-cresol and 2, 6-bis (bromomethyl)-4-bromophenol in the presence of TiCl4 was improved from less than 20％ to 40％, and the reaction time was reduced from several days to ten hours.展开更多
The behavior of water-soluble p-sulfonic calix[4]arene in capillary electrophoresiswas first reported. A mixture of nitrophenol isomers was completely separated using only3 mmol/L calixarene. The efficiency of 3. 0 &#...The behavior of water-soluble p-sulfonic calix[4]arene in capillary electrophoresiswas first reported. A mixture of nitrophenol isomers was completely separated using only3 mmol/L calixarene. The efficiency of 3. 0 × 105 plates/m was achieved and the detectionlimits were 33. 6, 21. 8 and 16. 2 pg for o-, m- and p- nitrophenol respectively under thecon-ditions fused-silica capillary(44 cm ×50 μm i. d., effective length 37 cm), phosphate buffer(50 mmol/L, PH 5. 0), 25℃, 14 kV, 275 nm and 1 s vacuum load.展开更多
文摘A modified [3+1] cyclization procedure for the synthesis of calix [4]arenes was developed by using diglycol dimethyl ether as the solvent in place of dioxane which was generally adopted in previous literature. By the modified procedure, the yield of 5-bromo-11, 23-di-tert-butyl-17-methyl-25, 26, 27, 28-tetrahydroxycalix[4]arene from cyclic condensation of 2, 6-bis(2’-hydroxy-5’-tert-butyl-benzyl)-4-cresol and 2, 6-bis (bromomethyl)-4-bromophenol in the presence of TiCl4 was improved from less than 20％ to 40％, and the reaction time was reduced from several days to ten hours.
文摘The behavior of water-soluble p-sulfonic calix[4]arene in capillary electrophoresiswas first reported. A mixture of nitrophenol isomers was completely separated using only3 mmol/L calixarene. The efficiency of 3. 0 × 105 plates/m was achieved and the detectionlimits were 33. 6, 21. 8 and 16. 2 pg for o-, m- and p- nitrophenol respectively under thecon-ditions fused-silica capillary(44 cm ×50 μm i. d., effective length 37 cm), phosphate buffer(50 mmol/L, PH 5. 0), 25℃, 14 kV, 275 nm and 1 s vacuum load.
