65558-67-0Relevant academic research and scientific papers
Metal-containing ditopic receptors for molecular recognition of diammonium cations
Kryatova, Olga P.,Kolchinski, Alexander G.,Rybak-Akimova, Elena V.
, p. 231 - 239 (2003)
Two new ditopic receptors for α,ω-alkanediyldiammonium cations based on a tetraazamacrocyclic (cyclidene) nickel(II) complex bearing two crown-ether residues were synthesized. The studies of the host-guest interaction between the receptors and a series of α,ω-diammonium salts by NMR titration in acetonitrile-d3 showed that 1:1 complexes are formed with Kassoc~103-105M-1. Receptor 1 with benzo-15-crown-5 arms showed substantial selectivity in binding of trimethylene- and tetramethylenediammonium dications, and 1-2 orders of magnitude weaker binding of shorter (C2) or longer (C5 and C6) diammonium cations. Receptor 2 with benzo-18-crown-6 arms showed higher affinity to all studied diammonium cations, but the recognition of the length of α,ω-diammonium cations was less pronounced.
Synthesis and radical polymerisation of methacrylic monomers with crown ethers or their dipodal counterparts in the pendant structure
Rey, Jimena,Garcia, Felix Clemente,Garcia, Jose Miguel
, p. 948 - 957 (2012/03/27)
The synthesis and radical polymerisation of methacrylic monomers with benzo-12-crown-4, benzo-15-crown-5, benzo-18-crown-6, and their dipodal counterparts in the ester residue is described. The radical polymerisation of the monomers in solution was carried out at different temperatures, and the polymerisation kinetics curves were obtained by direct measurement of the instantaneous monomer concentrations by nuclear magnetic resonance spectroscopy (NMR). Thus, the polymerisation rate parameter (2fkp/〈k t〉1/2), along with the polymer stereoregularity, were obtained in terms of the molar fractions of meso and racemo diads and of syndiotactic, isotactic and heterotactic triads. The interaction of the polymers with cations was studied using polymer networks as solid phases in the solid-liquid extraction of lanthanide cations from both organic and aqueous media.
Recognition-mediated regiocontrol of a dipolar cycloaddition reaction
Howell, Sarah J,Spencer, Neil,Philp, Douglas
, p. 4945 - 4954 (2007/10/03)
The rational design of a recognition-based system that is capable of accelerating and controlling the regiochemical outcome of a dipolar cycloaddition reaction between an azide and an alkyne is presented. The origins of the acceleration and control of the cycloaddition reactions are rationalized - using molecular mechanics calculations - in terms of the formation of a complex between the reagents which organizes and orients them prior to reaction.
Molecular Recognition Directed Self-assembly of Supramolecular Cyclindrical Channel-like Architecture from 6,7,9,10,12,13,15,16-Octahydro-1,4,7,10,13-pentaoxabenzocyclopentadecen-2-ylmethyl 3,4,5-Tris(p-dodecyloxybenzyloxy)benzoate
Percec, Virgil,Johansson, Gary,Heck, James,Ungar, Goran,Batty, Simon V.
, p. 1411 - 1420 (2007/10/02)
Complexation of the crown ether receptor of the benzo-15-crown-5 benzoate 6 6 with NaCF3SO3 and KCF3SO3 destabilizes the crystal
Benzocrown Derivatives as Ionophores for Alkali Cations, II. - Synthesis and Comparison of Urethane-, Ether-, and Ester-Linked Bis-Crown Compounds and Several "Crown-Ring Free" Analogues
Toeke, Laszlo,Bitter, Istvan,Agai, Bela,Hell, Zoltan,Lindner, Ernoe,et al.
, p. 549 - 554 (2007/10/02)
Nitro derivatives of bis-crown ethers with urethane (2), ether (10), and ester (9, 16) linkage not being able to form hydrogen bridges were synthesized, and their K(1+) selectivities were determined.A remarkable effect of the NO2 group on the selectivity was observed when a NO2***NH hydrogen bond could be formed while the others showed only slight improvement in general electroanalytical parameters.Several analogues without the crown ether ring (25, 26) were also prepared, but these compounds lost their alkaline ionophore properties.
Benzo-15-crown-5 Derivatives. Synthesis and Properies as Ion-extraction and Ion-transport Agents
Haines, Alan H.,Hodgkisson, Ian,Smith, Christopher
, p. 311 - 318 (2007/10/02)
The preparation of some derivatives of benzo-15-crown-5 is described, each containing a carbohydrate moiety attached through either an ester or an ether linkage.The ion-extraction properties into dichloromethane of these and other related benzo-15-crown-5
