134225-80-2Relevant academic research and scientific papers
Synthesis and metal ion extraction of calix[4]arene mono- and diacids with 2-methoxyethoxy pendant groups
Yang, Yanfei,Lee, Eun Kyung,Zhou, Hui,Surowiec, Kazimierz,Bartsch, Richard A.
experimental part, p. 197 - 204 (2012/03/27)
A mono-ionizable calix[4]arene-based ligand with three 2-methoxyethoxy pendant groups is synthesized. A di-ionizable analogue with two 2-methoxyethoxy pendant groups is also prepared. Competitive solvent extractions of alkali metal cations and of alkaline
Alkali metal cation cooperative anion recognition by heteroditopic bis(calix[4]arene) rhenium(i) bipyridyl and ferrocene receptor molecules
Cooper, James B.,Drew, Michael G. B.,Beer, Paul D.
, p. 2721 - 2728 (2007/10/03)
New heteroditopic bis(calix[4]arene) rhenium(i) bipyndyl (L1, L2) and ferrocene (L4) receptor molecules have been prepared and shown to bind a variety of anions at the upper rim and alkali metal cations at the lower rim. Proton NMR anion titration studies reveal the strength and selectivity of anion binding was dependent upon the presence of the calix[4]arene moieties and nature of the bridging group with the preorganised receptors L1 and L2 forming strong complexes in deuterated DMSO solutions. With L1, L2 and L4 co-bound lithium, sodium and potassium cations were found to significantly enhance the strength of iodide binding in acetonitrile solutions with the largest positive cooperative binding efTect observed with L2 and sodium cations. Cyclic voltammetric investigations revealed L4 to electrochemically recognise carboxylate and halide anions. In the presence of lithium cations the electrochemical response of L4 to bromide anions was significantly amplified. The Royal Society of Chemistry 2000.
Synthesis of Calix[4]arenes with four different "lower rim" substituents
Shu, Chun-Mei,Chung, Wen-Sheng,Wu, Sing-Ho,Ho, Zong-Chia,Lin, Lee-Gin
, p. 2673 - 2679 (2007/10/03)
Calix[4]arenes with four different "lower rim" substituents were synthesized following six-step sequences. The first alkyl group (R1) was introduced using R1X and CH3ONa, and then reaction with R2X and K2CO3 led to the introduction of a second alkyl group (R2) at the 3-position. Benzoate was introduced as a protecting group at the 1,3-O-disubstituent stage and was removed under basic conditions after the incorporation of the third alkyl group (R3) with R3X and NaH. The final alkyl group (R4) was introduced with R4X and NaH to give the chiral title compounds.
Alkali metal cation cooperative iodide anion recognition by new heteroditopic bis(calix[4]arene) rhenium(I) bipyridyl receptor molecules
Beer, Paul D.,Cooper, James B.
, p. 129 - 130 (2007/10/03)
New heteroditopic bis(calix[4]arene) rhenium(I) bipyridyl receptors are synthesised and shown to simultaneously bind alkali metal cations and iodide anion with positive cooperativity.
