共查询到19条相似文献,搜索用时 992 毫秒
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报道了"一锅法"合成含两种桥联链的新型杯[4]双冠醚和双杯[4]冠醚.杯[4]芳烃先与N,N’-乙撑基-二(2-氯乙酰胺)发生"1+1"缩合反应,然后直接加入三甘醇双对甲苯磺酸酯继续进行"2+2"缩合反应,合成了含两种桥联链的新型双杯[4]冠醚4.按照相似程序,杯[4]芳烃先后与N,N’-乙撑基-二(2-氯乙酰胺)、溴乙酸乙酯和二乙烯三胺反应,得到含两种桥联链的新型杯[4]双冠醚5.化合物5进一步与异硫氰酸苯酯反应合成带硫脲支链的杯[4]双冠醚6.所有新化合物的结构与构象经元素分析、质谱、核磁共振谱等表征证实. 相似文献
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首次合成一系列杯[10]冠醚。通过将对叔丁基杯[10]芳烃和乙二醇双对甲苯磺酸酯或多甘醇双对甲苯磺酸酯在K2CO3/甲苯或Cs2CO3/丙酮体系中反应,得到一系列杯[10]冠醚:1,2-杯[10]冠-4、1,3-杯[10]冠-2、1,2-,1,3-杯[10]冠-3、1,4-杯[10]冠-4、和1,6-杯[10]冠-4。 相似文献
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报道了一种间接缩合法高产率简便合成新型四桥联双杯[4]管道和1,2-3,4-双桥联杯[4]芳烃.杯[4]二酰肼衍生物2与丁二酸酐发生开环反应,以95%的产率得到杯[4]羧酸衍生物4.化合物4在DCC/DMAP/CH2Cl2体系中发生分子间自缩合反应,以90%产率得到新型四桥联双杯[4]管道6.改用高度稀释的条件则以26%的产率得到新型1,2-3,4-双桥联杯[4]芳烃5.新化合物的结构与构象经元素分析、红外、质谱、核磁共振谱等表征证实. 相似文献
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研究了在几种反应体系中对叔丁基杯[6]-1,4-冠醚的合成,发现K2CO3/甲苯体系能高选择性地合成目标物,产率比文献报道提高了近一倍。并对反应机理作了初步探讨。 相似文献
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含杯[4]芳烃毛细管固定相的制备与色谱性能 总被引:6,自引:2,他引:4
杯芳烃是由对位取代的苯酚在邻位通过亚甲基连接起来的环状化合物,由于具有可调节大小的空腔,不仅能络合无机离子,而且还可络合有机分子,在分析分离方面有极好的应用前景[1,2].杯芳烃已用于气相色谱[3,4]、离子选择性萃取[5,6]、液相色谱[7,8]和... 相似文献
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ChaoGuoYAN YunGE 《中国化学快报》2004,15(9):1019-1021
Three different synthetic routes were developed to introduce carbamoyloxy functional groups at the upper periphery of two calix[4]resorcinarenes. By treating activated esters 2a-b with excess corresponding amine such as 3-(dimethylamino)propylamine 3, ct-phenethylamine 4 and triethylenetetramine 5, six amide derivatives 6a-8b were obtained in high yield (Route 1). The pyridine-linked amide derivatives 9a-b were prepared by using acid chloride intermediate (Route 2).The amide derivatives 10a-b were obtained in moderate yields by direct alkylation of phenolic hydroxyl groups of la-b with N,N-dipropylchloroacetoamide in the presence of K2CO3/KI in acetone (Route 3). 相似文献
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By the Schiff-base condensation of formacyl calix[4]crown(2) with raw chitosan, a novel calix[4]crown- grafted chitosan chelating polymer(3) was conveniently prepared in good yield. The structure of polymer 3 was confirmed by elemental analysis, infrared(IR) spectrometry and X-ray diffraction(XRD) analysis. The elemental analysis suggests that the grafting degree of calixcrown unit was 22% on the amino groups of chitosan. The morphological characteristic of polymer 3 was studied by scanning electron microscopy(SEM). Polymer 3 possessed loose porous and smooth morphology of surface. The dyes adsorption abilities of polymer 3 for a series of organic dyes[Orange I(OI), Neutral red(NR), Victoria blue B(VB) and Brilliant green(BG)] were studied by solid-liquid adsorption experiments. The adsorption percentages increased from 45%―60%(raw chitosan for dyes) to 75%―90%(polymer 3 for dyes). The highest adsorption percentage reached 89% for VB. The saturated adsorption capacities for OI, NR, VB and BG were as high as 622, 564, 854 and 781 mg/g, respectively. The adsorption abilities kept stable at 70%―90% in the scope of pH=5―9. The adsorption abilities for anionic dye(OI) decreased gradually with the increase of pH and the opposite trend was observed for cationic dyes(NR, BG, VB). The adsorption percentages were 70%―90% after five times' cycles for adsorption. 相似文献
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A second generation of dendrimer with calixcrown as repeat unit was first synthesized. Its structure and conformation was determined by 1H NMR and MALDI-TOF mass spectra. 相似文献
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The p-tert-butyl calix[4] arene derivatives la with uracils and 1b with adenines at the lower rim were synthesized.The Interaction between 1a and 1b in CDCl3 solution was demonstrated by ^1H NMR spectra.The interfacial molecular recognitions of la and 1b for the complementary nucleosides in aqueous subphases were investigated by Langmuir-Blodgett technique. 相似文献
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Calixcrown-6 compounds carrying a pair of phenylazo moieties on the upper rim and two OH groups, one OH group, and two OR groups on the lower rim have been prepared in both the cone and partial cone conformations. UV/vis spectral measurements showed a red shift upon the addition of Ca2+ to the calixcrown carrying two OH groups and a blue shift for the calixcrown carrying two OR groups. For the compounds with two OR groups on the lower rim and a fixed partial cone conformation, a blue shift caused by electrostatic interaction between the oxygen atoms of OR and the metal ion as well as a red shift caused by the pi-metal complexation between the rotated calix benzene and the metal ion were observed. 相似文献
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The first examples of lariat calix[4]-1,3-aza-crowns with chiral amino acid groups as branched chains (5a and 5b) were designed and synthesized via a 1 + 1 addition reaction of calix[4]-1,3-substituted benzaldehyde derivative (4) and amino acid hydrazide derivatives (3a and 3b) in yields of 70% and 75%, respectively. The preliminary extraction experiments suggested that hosts 5a and 5b possessed good complexation abilities for α-amino acids. 相似文献