New aza-crown-ethers having the general formula (FORMULA) in which a) X is oxygen and R is hydrogen, alkyl, aralkyl, aryl, alkoxyalkyl, hydroxyalkyl, alkoxycarbonylalkyl, carbamoylalkyl, nitrophenyldiazophenyl or (FORMULA) in which n is 2 or 3, or b) X is N-R', and R and R' ...
ChemInform Abstract: Aza-Crown Ethers with Quinone Side Chains: Synthesis, Complexation, and Protonationmulti‐membered O,S‐heterocycles (O or S ring members)visible and UV spectra (organic substances)Synthesis and UV/VIS spectra of the crown ethers (III), (V), (VI) and (VIII) are ...
Aza-crown ethers differ from their oxo counterparts by their selectivity shift towards NH4+ over K+ and Na+ ions, when containing more than two N-atoms. For triaza crown ethers the affinity for binding ammonium ions was highest among the measured monovalent cations, in solution35 and as part...
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 ...
Aza-crown ethers are ligands in which the oxygen atoms are replaced by nitrogen atoms in the crown ether ring systems. This type of ligand possesses specific complexation with metal ions, such as those of transition-metals, rare earths, alkali metals and alkaline earths, which form metal complex...
The new preparing method for diamino aromatic ethers as the intermediate in preparation of aza-crown ether; 氮杂冠醚中间体二氨基芳醚制备的新方法2) diaryl ether 二芳基醚 1. The Applications of Arylboronic Acid in biaryl synthesis,synthesis of diaryl ethers,synthesis of aromatic amines and cataly...
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The kinetics of complex formation between 2,4,6-trinitrophenol and the aza-substituted crown ethers used were investigated and in all cases the results showed the occurrence of an oscillating chemical reaction in solution. 展开 关键词: 2,4,6-trinitrophenol aza-crown ethers molecular complexes ...
Bifanctional reagents in synthesis ofaza-crown ethers; 氮杂冠醚合成中的双功能基试剂 更多例句>> 6) aza-crown ether 氮杂冠醚 1. Therefore,aza-crown ethers have received much attention as receptors. 氮杂冠醚化合物不仅对碱金属、碱土金属离子有一定的配位作用,而且对过渡金属和重金属离子、铵盐等有着...
Synthesis of dibenzoazacrown ethers including a γ-piperidone moietymulti-membered O,N,S-heterocycles (with at least 2 different heteroatoms)ring closure reactionspyridine derivativesion exchange, zeolites, molecular sieves, crown ethers, clays