This paper focuses on the synthesis of a wide variety of di benzo spiro bis-crown compounds,
in good yields using di-phenols, mono tosylates of oligoethylene glycols and caesium carbonate
in acetonitrile.
Synthesis and complexation of molecular clips based on diphenylglycoluril and dibenzocrown ethers with alkali metal cations and paraquat
作者:Leonid S. Kikot、Catherine Yu. Kulygina、Alexander Yu. Lyapunov、Svetlana V. Shishkina、Roman I. Zubatyuk、Tatiana Yu. Bogashchenko、Tatiana I. Kirichenko
DOI:10.1016/j.tet.2018.08.008
日期:2018.9
A new synthetic route to the molecular clip with diphenylglycoluril and dibenzo-18-crown-6 using protection-deprotection protocol is proposed. Yield of desired compound has increased from 10-15% to 41%. Starting from 4,5-dibromobenzene-1,2-diol 4,5-dibromodibenzo-18-crown-6 and then tetrabromo-substituted molecular clip were obtained. The target molecular clip was obtained by bromine cleavage by hydrogenolysis
Competitive binding of Ba
<sup>2+</sup>
and Sr
<sup>2+</sup>
to 18‐Crown‐6 in a Receptor with a 1‐Methoxyanthraquinone Analogue as the Other Binding Site
作者:Tanmay Banerjee、Moorthy Suresh、Hirendra N. Ghosh、Amitava Das
DOI:10.1002/ejic.201100472
日期:2011.10
its affinity towards alkaline earth metalions from one of our previous reports. A new RuII-polypyridyl complex with two probable binding sites for metalions has been synthesised to which Ca2+, Sr2+ and Ba2+ were found to bind selectively over all other alkali, alkaline earth, transition and lanthanide metalions. Studies also confirmed binding of these metalions solely to the 18-crown-6 and not to
of functionalised calix[4]arenes, either with a 1,3-crown ether bridge or with an open-chain oligo ether moiety in 1,3-position were prepared and further equipped with additional deprotonisable sulfonamide groups to establish chelating systems for selected cations Sr2+, Ba2+, and Pb2+ ions. To improve the complexation behaviour towards these cations, calix[4]arenes with oligo ether groups and modified
Synthesis, crystal structures and competitive complexation property of a family of calix-crown hybrid molecules and their application in extraction of potassium from bittern
作者:Vallu Ramakrishna、E. Suresh、Vinod P. Boricha、Anjani K. Bhatt、Parimal Paul
DOI:10.1080/10610278.2015.1080367
日期:2015.10.3
ions. Complexation with K+ has been investigated by 1H NMR, association constants and thermodynamic parameters have been determined by isothermal calorimetric study. The molecular structures of one of the receptors and two of the K+ complexes have been established by single crystal X-ray study. One of the receptors formed bimetallic complex and it exhibited interesting polymeric network structure with