21062-20-4Relevant articles and documents
Solubilities of diglycolic acid esters in supercritical carbon dioxide
Xie, Yaoping,Yang, Hai-Jian,Wang, Wei,Chen, Rong
, p. 102 - 107 (2009)
A series of new CO2-soluble diglycolic acid esters were designed and synthesized, and their structures were confirmed by IR, NMR, and elemental analysis. The solubilities of compounds were measured at temperatures ranging from (313 to 333) K and pressures from (8.5 to 19.3) MPa in supercritical carbon dioxide. AU of the newly synthesized esters showed good to high solubility (as high as 1.25 mol % for compound 1) in supercritical CO2 at easily accessible temperatures and pressures. The measured solubility data were correlated using a semiempirical model. Consequently, the calculated results showed satisfactory agreement with the experimental data and differed from the measured values by between (3.18 and 19.58) %.
Host-Guest Complexation. 38. Cryptahemispherands and Their Complexes
Cram, Donald J.,Ho, Siew Peng,Knobler, Carolyn B.,Maverick, Emily,Trueblood, Kenneth N.
, p. 2989 - 2998 (1986)
Syntheses and crystal structures are reported for a new class of hosts, their complexes, and their precursors.The cryptahemispherands 5-8 are composed of molecular modules that are half spherand 1 and half cryptand 3.They were synthesized by the reactions of diacid chloride 20 with cyclic diamines 21-23 to produce diamides 13-16, reduction of which gave the desired hosts 5-8.These diamines were best purified, stored, and handled through their respective hydroborane complexes, 9-12.Hosts 6 and 7 are diastereomeric, as are diamides 14 and 15 and hydroborane complexes 10 and 11.Diamines 6 and 7 equilibrate rapidly at 25 deg C probably by ring inversion of the methoxyl groups to give a 5:1 ratio of 6 over 7.Diamides 14 and 15 equilibrate readily at 90 deg C to give only 14 in detectable amounts.Hydroborane complexes 10 and 11 do not equilibrate at 90 deg C.Cryptahemispherands 5, 6 and 8 formed a variety of complexes with the alkali metal cations, diamides 14 and 16 exhibited a low level of binding power, and hydroborane complexes 10 and 12 had no detectable affinity for the alkali metal cations.Hemispherand 17 was synthesized for comparison purposes.Crystal structures were determined for the isomeric diamides 14 and 15, for hydroborane complex 9, and for alkali cation complexes 5.NaB(Ph)4, 6.KSCN, 8.NaSCN, 8.KSCN, and 8.CsClO4.The trisanisyl modules of all eight compounds possess the same preorganized conformation, with the unshared electron pairs of the three methoxyl groups turned inward and the methyl groups outward.The potential cavities of 9, 14, and 15 are filled inward-turned hydrogens of the ethylene bridges.In the alkali metal ion complexes, the unshared electron pairs of the heteroatoms are all turned inward toward the quest metal ion.The use of CPK molecular models in predicting the structures of complexes is evaluated.
Solubilities of amide compounds in supercritical carbon dioxide
Liu, Jiang-Fan,Yang, Hai-Jian,Wang, Wei,Li, Zhongxiao
, p. 2189 - 2192 (2008)
2,2′-Oxybis(N,N-diethylacetamide), 2,2′-oxybis(N,N- dibutylacetamide), and 2,2′-oxybis(N,N-dihexylacetamide) were synthesized, and their structures were confirmed by IR, NMR, and elemental analysis. The solubilities of compounds were measured at temperatures ranging from (313 to 333) K and pressures from (8.7 to 16.4) MPa in supercritical carbon dioxide. The measured solubilities were correlated using a semiempirical model. The calculated results showed satisfactory agreement with the experimental data and differed from the measured values by between (4.54 and 30.84) %.
Novel process for synthesizing N,N,N',N'-tetraoctyl-3-oxyglutaramide
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Paragraph 0026; 0027; 0030; 0031; 0034; 0035, (2019/07/04)
The invention provides a novel process for synthesizing N,N,N',N'-tetraoctyl-3-oxyglutaramide (TODGA). The novel process includes the steps of firstly, allowing diglycolic acid to have reaction with SOCl2 to generate diglycolic acyl chloride, and allowing the diglycolic acyl chloride to have reaction with amine to generate part of TODGA; secondly, removing components, which can be easily dissolvedin water, in the byproducts, and separating to obtain monooxaamide carboxylic acid; thirdly, allowing the monooxaamide carboxylic acid to have reaction with amine to generate part of TODGA again. Bythe novel process with the features of an existing process, high yield is achieved.
Selective recovery of rare earth elements using chelating ligands grafted on mesoporous surfaces
Florek, Justyna,Mushtaq, Ambreen,Larivière, Dominic,Cantin, Gabrielle,Fontaine, Frédéric-Georges,Kleitz, Freddy
, p. 103782 - 103789 (2015/12/24)
Nowadays, rare earth elements (REEs) and their compounds are critical for the rapidly growing advanced technology sectors and clean energy demands. However, their separation and purification still remain challenging. Among different extracting agents used for REE separation, the diglycolamide (DGA)-based materials have attracted increasing attention as one of the most effective extracting agents. In this contribution, a series of new and element-selective sorbents were generated through derivatisation of the diglycolamide ligand (DGA), grafted to mesoporous silica and tested for the separation of rare earth elements. It is shown that, by tuning the ligand bite angle and its environment, it is possible to improve the selectivity towards specific rare earth elements.