期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Synthesis and Conformational Studies of Some Metacyclophane Compounds
1
作者 Louis Korbla Doamekpor Vincent Kodzo Nartey +1 位作者 Raphael Kwaku Klake Takehiko Yamato 《International Journal of Organic Chemistry》 2012年第2期152-158,共7页
Various [3.3.3]metacyclophane derivatives were synthesized from 6,15,24-tri-tert-butyl-9,18,27-trimethoxy [3.3.3] metacyclophane-2,11,20-trione 1 using simple chemical reactions. The conformations of the synthesized c... Various [3.3.3]metacyclophane derivatives were synthesized from 6,15,24-tri-tert-butyl-9,18,27-trimethoxy [3.3.3] metacyclophane-2,11,20-trione 1 using simple chemical reactions. The conformations of the synthesized compounds were studied using mainly solution Proton Nuclear Magnetic Resonance (1H NMR) spectroscopic methods. Two of the synthesized compounds 5, 6, were found to have a partial cone conformation with the third, 4, having the cone conformation. Detailed variable temperature Proton Nuclear Magnetic Resonance studies further confirmed the partialcone conformation for the two products, 5, 6. During the variable temperature nuclear magnetic resonance spectroscopic studies, 6,15,24-tri-tert-butyl-9,18,27-trimethoxy[3.3.3]metacyclophane-2,11,20-triol was found to have a coalescence temperature of about 0?C. 展开更多
关键词 metacyclophanes CALIXARENES CONE Partial-Cone CONFORMERS Variable TEMPERATURE Proton Nuclear Magnetic Resonance Spectroscopy COALESCENCE TEMPERATURE
下载PDF
Synthesis and Conformational Studies on [3.3.3]Metacyclophane Oligoketone Derivatives, and Their Metal Ion Recognition
2
作者 Louis Korbla Doamekpor Raphael Kwaku Klake +3 位作者 Vincent Kodzo Nartey Takehiko Yamato Oti Gyamfi Dennis Adotey 《International Journal of Organic Chemistry》 2015年第2期126-135,共10页
Chemical reactions were used to synthesize 2,11,20-tris(ethanedithia)-9,18,27-trimethoxy-6,15, 24-tri-tert-butyl[3.3.3]metacyclophane 2 and 2,11-bis(ethanedithia)-9,18,27-trimethoxy-6,15,24-tri-tert-butyl[3.3.3]metacy... Chemical reactions were used to synthesize 2,11,20-tris(ethanedithia)-9,18,27-trimethoxy-6,15, 24-tri-tert-butyl[3.3.3]metacyclophane 2 and 2,11-bis(ethanedithia)-9,18,27-trimethoxy-6,15,24-tri-tert-butyl[3.3.3]metacyclophane 4 from 6,15,24-tri-tert-butyl-9,18,27-trimethoxy[3.3.3]meta-cyclophane-2,11,20-trione 1 and -2,11-dione 3. The yields of 2 and 4 were 70% and 81% respectively. The conformations of the synthesized compounds 2 and 4 were studied using mainly solution Proton Nuclear Magnetic Resonance (1H NMR) spectroscopic methods. Compounds 2 and 4 were found to have a partial-cone conformation. Detailed variable temperature Proton Nuclear Magnetic Resonance studies further confirmed the partial-cone conformation for the two products, 2, 4. During the variable temperature nuclear magnetic resonance spectroscopic studies, compound 2 was found to have a coalescence temperature of about 0?C. Extraction of silver ions with compound 2 gave an extractability of 82% while the parent compound 1 showed zero (0) silver affinity. A 1:1 mol/mol mixture of compound 2 and silver ions studied by solution 1H NMR revealed a novel “Molecular Roulette” type of motion. 展开更多
关键词 metacyclophanes MACROCYCLIC Compounds CONE Partial-Cone CONFORMATION Variable TEMPERATURE Proton Nuclear Magnetic Resonance Spectroscopy COALESCENCE TEMPERATURE
下载PDF
Chloride anion-induced dimer capsule based on a polyfluorinated macrocycle meta-WreathArene
3
作者 Shu Niu Hongyan Xiao +1 位作者 Xiao-Di Yang Huan Cong 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第7期137-140,共4页
[1_n]metacyclophanes are a class of important building blocks for supramolecular assembly of artificial capsules. Herein we present the preparation and properties of a novel polyfluorinated macrocycle metaWreath Arene... [1_n]metacyclophanes are a class of important building blocks for supramolecular assembly of artificial capsules. Herein we present the preparation and properties of a novel polyfluorinated macrocycle metaWreath Arene, a C_(2)-symmetrical [14]metacyclophane. Adopting a cone conformation in acetone solution,the macrocycle can form dimer capsules through hydrogen bonds induced by chloride anions. Each dimer capsule consists of two meta-Wreath Arene and two chloride anions, and has been unambiguously characterized both in solution and in solid state. 展开更多
关键词 MACROCYCLE METACYCLOPHANE ANION Assembly CAPSULE
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部