38559-92-1Relevant articles and documents
Extractant as well as preparation method and application thereof
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Paragraph 0081-0084, (2021/09/15)
The invention relates to the field of separation and enrichment of metals, in particular to an extractant, a preparation method and application thereof. The preparation method comprises the followingsteps that a phenol compound reacts with a halogenated carboxylic acid derivative or halogenated carboxylate in a solvent, then acidifying is carried out, and the phenoxy carboxylic acid extractant issynthesized. The prepared extractant can be used for enriching rare earth in rare earth mineral leachate after being saponified by an alkaline compound; compared with the existing extractant, the extractant has the advantages of being higher in precipitation capacity, high in precipitation efficiency and large in precipitation particles, facilitating the separation of a rare earth extraction complex and a water phase and improving the production efficiency; and moreover, the extractant can further be used for selectively recovering/separating valuable metals from different industries.
Copper(II)-catalyzed hydroxylation of aryl halides using glycolic acid as a ligand
Xiao, Yan,Xu, Yongnan,Cheon, Hwan-Sung,Chae, Junghyun
, p. 5804 - 5809 (2013/07/25)
Copper(II)-catalyzed hydroxylation of aryl halides has been developed to afford functionalized phenols. The protocol utilizes the reagent combination of Cu(OH)2, glycolic acid, and NaOH in aqueous DMSO, all of which are cheap, readily available, and easily removable after the reaction. A broad range of aryl iodides and activated aryl bromides were transformed into the corresponding phenols in excellent yields. Moreover, it has been shown that C-O(alkyl)-coupled product, instead of phenol, can be predominantly formed under similar reaction conditions.
The Synthesis and Transition Temperatures of Novel Low Molar Mass Cholesteric Materials Derived from (R)-2-(4-Hydroxyphenoxy)propanoic Acid
Booth, Christopher J.,Gray, George W.,Toyne, Kenneth J.,Hardy, Judith
, p. 31 - 58 (2007/10/02)
A comprehensive series of (R)-2-(4-substituted-phenoxy)propanoates and (R)-2-(4-substituted-phenoxy)propanonitriles have been prepared.A wide variety of 4-substituents and ester functions have been examined to determine how the position of the chiral centre affects the cholesteric phase formation in these classes of materials; the synthesis of these novel materials, their transition temperatures and a procedure for assessing their optical purity are described and discussed.Mesogenicity is significantly depressed if the chiral centre is placed centrally within the molecule.