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Rigidified naphtho-aza-crown ethers: synthesis and ion selectivity …?

Rigidified naphtho-aza-crown ethers: synthesis and ion selectivity …?

WebOct 30, 2016 · synthesis and adsorption properties for metal ions of crosslinked chitosan acetate crown ethers.pdf 2016-10-30 上传 synthesis and adsorption properties for metal ions of crosslinked chitosan acetate crown ethers The synthesis of aza crown ethers are subject to the challenges associated with the preparation of macrocycles. The 18-membered ring in (CH2CH2NH)6 can be synthesized by combining two triamine components. By reaction with tosyl chloride, diethylene triamine is converted to a derivative with two … See more In organic chemistry, an aza-crown ether is an aza analogue of a crown ether (cyclic polyether). That is, it has a nitrogen atom (amine linkage, −NH− or >N−) in place of each oxygen atom (ether linkage, −O−) around the See more Many kinds of aza crown ethers exist. Variable length linkers Aza crowns often feature trimethylene ((CH2)3) as well as ethylene ((CH2)2) linkages. One example is cyclam (1,4,8,11-tetraazacyclotetradecane). Tertiary amines See more arabic letters with meaning WebArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. WebOct 29, 2024 · This work presents the synthesis of six new phase-transfer organocatalysts in which the squaramide unit is directly linked to the nitrogen atom of an aza-crown ether. Four chiral skeletons, namely hydroquinine, quinine, cinchonine (cinchonas), and α-d-glucopyranoside were responsible for the asymmetric construction of an all-carbon … ac resistor testing WebSynthetic and natural ionophores have been developed to catalyze ion transport and have been shown to exhibit a variety of biological effects. We synthesized 24 aza- and diaza-crown ethers containing adamantyl, adamantylalkyl, aminomethylbenzoyl, and ε-aminocaproyl substituents and analyzed their biological effects in vitro. Ten of the … WebIt is well known that aza-crown ethers are a kind of good complexing agents for transition-metal ions [18 21]. Due to the different ring sizes of aza-crown ethers, the compositions of their complexes binding with metal ions are different. Previously, the metal complexes of aza-crown ethers designed and ac resistance of inductor WebAug 13, 2024 · Crown ethers (CRs) are one of the generally used host molecules to increase selectivity of heavy metal ions (HMIs) in electrochemical analysis. To study the cavity size and geometry induced ions selectivity change in naphtho-aza-crown ethers (NACEs), three novel rigidified NACEs have been synthesized and characterized by 1H …

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