Dibenzo-18-crown polymer supported

Talanova, G. G., Yatsimirskii, K. B., and Kravchenko, O. V. (2000) Peculiarities of Dipotassium Palladium Tetrachloride (K PdCli) and Dipotassium Platinum Tetrachloride ( PtCLt) Complexation with Polymer-supported Dibenzo-18-crown-6, Ind. Eng. Chem. Res. 39, 3611-3615. 

Brown PR, Hallman JL, Whaley LW, Desai DH, Pugia MJ, Bartsch RA, Competitive, proton-coupled, alkah metal cation transport across polymer-supported hquid membranes containing sym-(decyl)-dibenzo-16-crown-5-oxyacetic acid Variation of the alkyl 2-mtrophenyl ether membrane solvent. J. Membr. Sci. 1991 56, 195-206. Michaels AS, Membranes, membrane processes, and their apphcations Needs, unsolved problems, and challenges of the 1990s. Desahnation, 1990 77, 5-34. 

The second method employed sodium borohydride complexed by polymer-supported dibenzo-18-crown-6. When used to reduce 4-/m-butylcyclohexanone in benzene, it was reported that the owii(diequatorial)-product resulted exclusively in 95% yield101. 

C.Y. Zhu and R.M. Izatt, Macrocyclic-mediated separation of Eu2+ from trivalent lanthanide cations in a modified thin-sheet-supported liquid membrane system, J. Membr. Sci., 1990, 50, 319 P.R. Brown, J.L. Hallman, L.W. Whaley, D.H. Desai, M.J. Pugia and R.A. Bartsch, Competitive, proton-coupled, alkali metal cation transport across polymer-supported liquid membranes containing s>yn(decyl-dibenzo-16-crown-5-oxyacetic acid) Variation of the alkyl 2-nitrophenyl ether membrane, ibid., 1991, 56, 195. 

Crown ethers have been immobilized within polymer supports and used in metal ion separation, Crown ether moieties at cross-linked polystyrene have been prepared by the reaction of cross-linked chloromethylated polystyrene with hydroxyl-substituted crown ethers [52], The resins 15 formed from the condensation of dibenzo—18-crown-6 and formaldehyde were modified with phosphonate monoethylester and phosphonic acid groups [53]. Resin 15 demonstrates selectivity for K(I) over the other alkali metal ions at pH < 8, and selectivity for Li(I) at pH > 8. A resin 16 prepared from the condensation of a substituted crown ether with formaldehyde is selective for Na(I) over the other alkali metal ions [54],... 

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