Academic literature on the topic 'Crown ether synthesis'

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Journal articles on the topic "Crown ether synthesis"

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Fronczek, Frank R., Richard D. Gandour, Thomas M. Fyles, Philippa J. Hocking, Susan J. McDermid, and P. Daniel Wotton. "Polycarboxylate crown ethers from meso-tartaric acid." Canadian Journal of Chemistry 69, no. 1 (1991): 12–19. http://dx.doi.org/10.1139/v91-003.

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The synthesis of crown ethers derived from meso-tartaric acid was investigated. The sodium salt of the bis(dimethylamide) of meso-tartaric acid reacted with diethylene glycol ditosylate to give a mixture of 18-crown-6 tetraamide and 27-crown-9 hexaamide crown ethers. The 2R,3S,11S,12R 18-crown-6 isomer crystallized in triclinic space group [Formula: see text] (a = 7.557(2), b = 8.866(2), c = 10.4133(13) Å, α = 94.13(2), β = 95.86(2), γ = 99.26(2)°, R = 0.040 for 2090 observed of 3129 unique reflections). The structures of the remaining products were then assigned from the NMR spectra. The solution conformations of the amide crown ethers were examined by NMR, and provide a rationale for the product distribution obtained. One of the 18-crown-6 isomers and a mixture of the two 27-crown-9 isomers were hydrolyzed to the respective crown ether carboxylic acids, and the stability constants for complexation of cations were determined by potentiometric titration. The meso tetra- and hexacarboxylates are remarkably nonselective and inefficient cation complexing agents, compared to related crown ethers from R,R-(+)-tartaric acid, due to the unfavorable conformational control exerted by the tartaro units. Key words: crown ether synthesis, complexation, crown ether conformation, meso-tartaric acid, crystal structure.
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Anantanarayan, Ashok, and Thomas M. Fyles. "Polycarboxylate diaza crown ethers derived from R,R-(+)-tartaric acid: synthesis and complexation of metal ions." Canadian Journal of Chemistry 68, no. 8 (1990): 1338–51. http://dx.doi.org/10.1139/v90-206.

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The synthesis and complexation properties of polycarboxylate diaza crown ethers based on R,R-(+)-tartaric acid are described. Cesium carbonate mediated macrocyclization of a bis-tosylamide precursor with a bis-tosylate precursor provided the protected crown ethers. Photochemical deprotection of the tosylamides and hydrolysis of the carboxamides yielded dicarboxylic and tetracarboxylic acid derivatives of 1,10-diaza-18-crown-6. N-Methylenecarboxylate (N-acetate) derivatives were prepared by N-alkylation with bromoacetic acid. The synthetic and purification procedures developed provide samples of the ligands in a metal-free form. Acidity and stability constants for complexation of alkali metal, alkaline earth, late- and post-transition metal cations were determined by potentiometric titration. The ligands form complexes which show enhancement of stability by charge–charge and chelate interaction with the carboxylates. In comparison with crown ether polycarboxylates these aza crown ethers showed a selectivity for softer metal ions relative to alkali and alkaline earth metal ions. N-Methylenecarboxylate chelate ligands were found to bind almost all types of metal ions, due to a highly co-operative array of charge–charge, chelate and crown ether interactions. Keywords: aza crown ether synthesis, tartaric acid, potentiometric titration, cation complexation, aminocarboxylate complexone.
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Dutton, Philip J., Thomas M. Fyles, and Susan J. McDermid. "Synthesis and metal ion complexation behavior of polycarboxylate 18-crown-6 ethers derived from tartaric acid." Canadian Journal of Chemistry 66, no. 5 (1988): 1097–108. http://dx.doi.org/10.1139/v88-181.

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The metal ion complexation behavior of four 18-crown-6 ethers derived from (+)- and meso-tartaric acid is examined. Preparations of a meso-crown ether diacid and of a crown ether hexacid from three units of (+)-tartaric acid are described. Acidity constants and stability constants for complexation of metal cations in aqueous solution were determined by potentiometric titration. The complexes are substantially stabilized by favourable electrostatic interactions and are of similar stability to complexes of cryptands and EDTA. The complexation behavior of the series can be rationalized in terms of electrostatic interactions, direct coordination of the cations by at least one carboxylate from the crown ether periphery, and rigidification of the ligands as the anionic charge increases. Distributions of charge influence the relative stability of isomeric complexes. Highly charged polycarboxylate crown ethers are effective, but relatively unselective, cation complexing agents for a range of cations. The complexes are stable to pH 3 and the ligands can be used as simultaneous pH and metal ion buffers.
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Fyles, Thomas M., and Valia Veettil Suresh. "Photoionophores derived from crown ether polycarboxylic acids: synthesis, ion binding, and spectroscopic characterization." Canadian Journal of Chemistry 72, no. 5 (1994): 1246–53. http://dx.doi.org/10.1139/v94-158.

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Three types of potential photoionophores based on polycarboxylic acid crown ethers were prepared, and their cation complexation behaviours and spectroscopic properties were surveyed. The first type were neutral macropolycyclic hosts prepared by capping across the faces of the crown ether with aromatic diamine chromophores. The second were bis-crown ether carboxylates bearing a bridging aromatic chromophore. The third type appended an additional chromophore-donor site on the crown ether carboxylic acid framework. Cation complexation was examined by potentiometric titration. The neutral ligands were rather poor hosts for alkali metal cations. The other two types of crown ether carboxylates showed a combination of size selectivity and electrostatic stabilization, leading to significant and selective ion binding in water. Ligands of the third type also exhibited cation-dependent absorption spectra in neutral and basic aqueous solution. No significant alkali metal or alkaline earth cation-induced perturbation of the emission spectra was uncovered, but a sodium- and cesium-dependent long wavelength emission enhancement was observed in one of the neutral ligand systems.
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Kobiro, Kazuya, Mitsuru Takahashi, Shigeki Takada, Kiyomi Kakiuchi, Yoshito Tobe, and Yoshinobu Odaira. "TRIDECALINO-18-CROWN-6. SYNTHESIS OF CYLINDRICAL CROWN ETHER." Chemistry Letters 15, no. 4 (1986): 455–58. http://dx.doi.org/10.1246/cl.1986.455.

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Sacarescu, Liviu, Rodinel Ardeleanu, Gabriela Sacarescu, and Mihaela Simionescu. "Synthesis of new polysilane–crown ether." European Polymer Journal 40, no. 1 (2004): 57–62. http://dx.doi.org/10.1016/j.eurpolymj.2003.09.012.

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Oshima, Takumi, and Toshikazu Nagai. "Synthesis of Substituted Crown Ether Acetals." Bulletin of the Chemical Society of Japan 59, no. 12 (1986): 3979–80. http://dx.doi.org/10.1246/bcsj.59.3979.

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Gibson, Harry W., and Sang-Hun Lee. "42-crown-14-based [2]catenane." Canadian Journal of Chemistry 78, no. 3 (2000): 347–55. http://dx.doi.org/10.1139/v00-017.

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A compound isolated from a synthesis directed toward 42-crown-14 (42C14) has been purified and characterized by means of IR, HPLC, NMR, MS, and DSC techniques. Its infrared spectrum contains no OH, tosylate, or unsaturated unit signals. The HPLC retention time of the compound differs from that of "42C14" and other crown ethers examined. The chemical shifts of the singlets in the 1H and 13C NMR spectra differ from those of poly(ethylene oxide)s (PEOs), and crown ethers. The FAB mass spectra contain signals attributable to a compound with twice the mass of 42C14 and the fragmentation pattern is consistent with [2]catenane 9 based on interlocked 42C14 units, because the next major signals generally correspond to 42C14 and its adducts. The DSC results showed that the compound, a colorless wax at room temperature, was amorphous with a glass transition temperature which was 80° higher than those of aliphatic crown ethers, which are crystalline compounds with melting points >40°C. Considering the high yield of the compound (8% in the reaction mixture as determined by NMR, 1.7% isolated), it is believed that sodium cation-crown ether-linear ether complexation was involved in templating its formation. Evidence for such complexation was also observed in the FAB MS.Key words: catenanes, crown compounds, macrocycles, template synthesis, rotaxanes.
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Topal, Sevinc Z., Devrim Atilla, Kadriye Ertekin, Jean B. Tommasino, Dominique Luneau, and Ayşe G. Gürek. "Investigation of optical and electrochemical properties as well as metal ion sensitivities of different number of crown ether appended phthalocyanines." Journal of Porphyrins and Phthalocyanines 17, no. 08n09 (2013): 682–90. http://dx.doi.org/10.1142/s1088424612501477.

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We report herein, the synthesis, and spectral and electrochemical characterization of a series of phthalocyaninato zinc complexes where two biomedically potential structures; crown ether and phthalocyanine moities were gathered on the same molecule. The effect of number of crown ether moieties on metal ion binding properties, as well as proton sensitivity were investigated by using electronic absorption and fluorescence emission spectra. Spectral behaviors of the zinc phthalocyanine complexes fused with one crown ether; Zn [ Pc (15 C 5)( C 6 H 13)6] and four crown ether; Zn [ Pc (15 C 5)4] in presence of Na + and K + ions were investigated into detail because of host-guest interactions of subjective ions with crown ether moieties, and compared with the crown ether free phthalocyanine; Zn [ Pc ( C 6 H 13)8].
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Liu, Zhaona, Huacheng Zhang, and Jie Han. "Crown ether–pillararene hybrid macrocyclic systems." Organic & Biomolecular Chemistry 19, no. 15 (2021): 3287–302. http://dx.doi.org/10.1039/d1ob00222h.

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Dissertations / Theses on the topic "Crown ether synthesis"

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Huang, Zilin. "Synthesis and Complexation Studies of Novel Functionalized Crown Ethers and Azacrown Ethers." Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5593/.

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Novel cage-functionalized azacrown ethers, i.e. 51, 52, 53, 55, 57, 61 and 62, which have various crown cavity and different number of nitrogen atoms incorporated, have been prepared. X-ray structures of 53, 55 and 57 have been obtained for the study of the crown topological structure. The complexation properties of crown 51, 52, 57, 61 and 62 have been evaluated via alkali metal picrate extraction, silver picrate extraction and ESI-MS study. The novel cage-fuctionalized azacrown ethers generally exhibit high avidity and selectivity towards Ag+ versus alkali metal ions and some transition metals i.e. Cu2+, Mn2+, Zn2+, Ni2+ and Pb2+. Crown 61 displays significant avidity and selectivity toward K+ in alkali metal picrate extraction experiments vis-à-vis the remaining alkali metal picrates. Three types of ditopic ion-exchange receptors for sodium hydroxide extraction study have been designed. All of the crown ether molecules have proper cavity for selective sodium complexation and have weakly acidic ionizable alcohols for sodium-proton exchange under strongly basic conditions. Crown 80 and 81 were synthesized; key intermediates for the synthesis of crown 82, 83 and 84 have been prepared. The preparation of 99 afforded an unexpected crown 103. The preparation of 109 had been attempted, but could not be successfully isolated. Four novel cage-functionalized calix[4]arene crown-5, i.e. 113-116, have been synthesized. The structures of 113 and 116 have been established by X-ray crystal structural analysis and NMR spectral analysis. The complexation properties of the four ionic receptors have been studied via alkali metal picrate extraction experiments. Crown 115 and 116 display more than modest avidity toward alkali metal ions and are most selective toward K+ vis-à-vis 113 and 114.
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Huang, Zilin. "Synthesis and Properties of Novel Cage-Annulated Crown Ethers." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc5523/.

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Three cage-functionalized polyoxacrown ethers (9, 10 and 12) and four novel cage-functionalized polyoxamonoazacrown ethers (18, 20, 25 and 29) that contain 3,5-disubstituted-4-oxahexacyclo[5.4.0.02,6.03,10.05,9.08,11]dodecane ("oxahexacyclic") moiety have been synthesized and their respective alkali metal picrate extraction profiles along with that of three analogues 13, 14 and 21 have been obtained. The observed avidities and selectivities of the host molecules toward complexation and transport of alkali metal picrates can be related to the size and shape of their respective macrocyclic cavity and the number of donor atoms. The effect of N-alkyl substitution on the complexation properties of azacrown ethers has been studied. The avidity of N-Et azacrown ethers toward complexation with alkali metal cations is generally higher than that of the corresponding non-N-alkylated hosts. However, the presence of an N-Et group appears to have a negligible effect upon their relative selectivities in their regards. The effect of pH on extraction process was studied; it was thereby determined that the alkali metal picrate extraction experiments are best performed at high pH (ca. 11-12).
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Han, Dong. "Synthesis of Crown Ether/Ammonium Salt for Electron Transfer Study." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3141/.

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The theoretical model of Beratan and Onuchic predicts a large attenuation of ET rates through hydrogen bonds; however, the effect of individual hydrogen bond on electron transfer reaction has not been systematically studied. The organic complexes in this study are a series of crown ether/ammonium salt, which incorporate a redox partner on each component of the complex. The dimethoxynaphthalene redox donor was attached to the crown ether and a series of ammonium salts was synthesized which bear substituted quinone and naphthoquinone acceptor. The complexes characterization and preliminary electron transfer rate measurement were completed with UV/Vis and steady-state emission spectroscopy.
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Richardson, N. M. "The synthesis and properties of porphyrins with crown ether caps." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383427.

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Yonekawa, Sayuri. "The synthesis and study of an amine functionalized crown ether." Virtual Press, 2004. http://liblink.bsu.edu/uhtbin/catkey/1295147.

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This study has resulted in a route to the first known NHZ functionalized xylenebased crown ether, 5-amino-2-methoxy-1,3-xylyl-18-crown-5. The route involves preparing 5-azido-2-methoxy-1,3-xylyl-18-crown-5 from 5-bromo-2-methoxy-1,3-xylyl18-crown-5 by reacting it in turn with n-BuLi and tosyl azide. 5-Amino-2-methoxy-1,3xylyl-l8-crown-5 was obtained by reducing 5-azido-2-methoxy-1,3-xylyl-l8-crown-5 with aqueous sodium borohydride in the presence of a phase transfer agent. The 'H NMR spectrum of the amino derivative showed NMR signals at 6 3.4-3.7 (crown CHZ), S 4.0 (benzylic), S 4.47 (methoxy), and 6 6.58 (aromatic) ppm. The integrated areas were consistent with the formula, and they also suggested the NH2 protons were in the crown CH2 area. The IR (KBr pellet) spectrum showed bands at 3408 cm' and 3364 cm' corresponding to the N-H asymmetric and symmetric stretches, respectively. This study has also provided a new procedure for the preparation of 4-bromo-2,6-bis(bromomethyl) anisole, which was the intermediate for 5-bromo-2-methoxy-1,3-xylyl-18-crown-5. It involved reacting 4-bromophenol in turn with 30 % formaldehyde, dimethylsulfate, and HBr in acetic acid.<br>Department of Chemistry
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Keefer, Chad D. "The synthesis and study of a phosphine functionalized crown ether." Virtual Press, 2005. http://liblink.bsu.edu/uhtbin/catkey/1318448.

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This study has resulted in a phosphine funetionalized crown ether. synrdiQ-methoxy-5-diphenylphosphino-1.3-cplyl l-24-crown-6, obtained tkmt a live step synthesis. 4-13romophenol was treated in turn with formaldehyde. di methyl sulfate, and phosphorous trihromide. producing 4-bromo-2.6-his(bromomethyl )anisole. The key intermediate. spm-di(2-methoz}-5-bromo-I.3-z( I).l )-24-crown-6. was obtained from treating 4-hromo-3.6-bis(bromomethyl )anisole with diethylenc glycol and potassium thutoyide. The potassium ion apparently provided a template to assist the formation of the product. SLm-di(2-methosp-5-diphenylphosphino- I.3-x lyl )-24-crown-6 was obtained from treating sm-di(2-methos5-5-hromo-I.3-x'kI -24-crown-6 in sequence with n-BuLi and methyldiphern I phosphinite. The nP NMR of the phosphine crown ether showed a single signal at 6 -5.35 ppm. consistent with the formation of a single product.The'1I NMR of the phosphine crown ether in chloroform-d showed signals at6354-3.56 (crown CIF). 3.61 I OCI I;I. 4.44 (benzylic Cl I.6 and 7.25-7.29 (aromatic Ii) ppm.The integrated areas were consistent with the formula. The `C NNIR of the phosphine crown ether in chloroform-d displaced signals at 6 63.1, 68.5. 70.0. 70.1. 128.5 and 128.6 (d). 128.7. 131.8 and 131.9 (d), 132.0. 133.6 and 133.7 (d). 136.1 and 136.4 (d). 137.4 and 137.5 (dl, and 158.4 ppm. The "C signals were consistent with the formula and structure. The br)minated crown ether was characterized with 'I I and ''C NMR. as well as X-ray crystallography and elemental analysis.<br>Department of Chemistry
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Hazlewood, Anna. "Synthesis and properties of novel cage-functionalized crown ethers and cryptands." Thesis, University of North Texas, 2001. https://digital.library.unt.edu/ark:/67531/metadc2896/.

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A novel cryptand was synthesized which contained a 3,5-disubstituted-4- oxahexacyclo[5.4.1.02,6.03,10.05,9.08,11] dodecane "cage" moiety. In alkali metal picrate extraction experiments the cryptand exhibited high avidity towards Rb+ and Cs+, when compared with the corresponding model compound. A computational study of a series of cage-functionalized cryptands and their alkali metal-complexes was performed. The X-ray crystal structure of a K+-complexed bis-cage-annulated 20-crown-6 was obtained. The associated picrate anion was found to be intimately involved in stabilization of the host-guest complex. The interaction energy between the host-guest complex and picrate anion has been calculated, and the energy thereby obtained has been corrected for basis set superposition error.
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Kleissler, Charles Richard. "Comparison of poly(vinyl alcohol) backbone-grafted ethers and chain-growth crown ether polymers in selective cation adsorption." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/10115.

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Crabill, Todd W. "The synthesis and study of a crown ether functionalized with both phosphine and phenol groups." Virtual Press, 2005. http://liblink.bsu.edu/uhtbin/catkey/1327790.

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This study has resulted in a crown ether functionalized with both phosphine and phenol groups, 5-diphenylphosphino-1,3-xylyl-18-crown-5. The target molecule was obtained from a six step synthesis. 4-Bromophenol was treated in sequence with formaldehyde, dimethylsulfate, and phosphorus tribromide producing 4-bromo-2,6-bis(bromomethyl)anisole. The main intermediate, 5-diphenylphosphino-1,3-xylyl-18-crown-5, was obtained by treating 4-bromo-2,6-bis(bromomethyl)anisole in sequence with tetraethylene glycol, lithium iodide, and methyldiphenyl phosphonite. The lithium iodide cleaved the anisole-to-methyl group bond, and the methyldiphenyl phosphonite provided the phosphine group for the crown ether following a lithium bromine exchange reaction. The 31P NMR of the phosphine crown ether showed a single signal at 6 -5.9, showing consistency of a single product. The IH NMR of the phosphine crown ether in deuterated chloroform showed signals at 6 3.55-3.7 (crown CH2), 6 4.6 (benzylic CH2), 6 7.1 (d, J = 7.o Hz, crown aromatic CH2), and 6 7.2-7.4 (noncrown aromatic CH2).<br>Department of Chemistry
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Lewis, R. K. "Synthetic receptor molecules." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356259.

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Books on the topic "Crown ether synthesis"

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Nesterov, S. V. Dicyclohexanocrown ethers: From synthesis to radiochemical applications. Nova Science Publishers, 2011.

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Mooney, Nichola Jane. Synthesis and properties of crown ethers incorporating Xanthene residues. University of Manchester, 1993.

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Hurwood, Tracey Victoria. Synthesis and properties of crown ethers incorporating 4,5-dihydroxyxanthone. University of Manchester, 1995.

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Cram, Donald J. Container molecules and their guests. Royal Society of Chemistry, 1994.

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CRAM, D., and J. CRAM. CONTAINER MOLECULES (Monographs in Supramolecular Chemistry). Royal Society of Chemistry, 1997.

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Smith, Glynda A. The synthesis and examination of lipophilic crown ethers as selective reagents for lithium. 1990.

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Wilcox, Kurt D. The syntheses and examination of crown ethers as selective reagents for lithium and sodium. 1989.

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A, Tashmukhamedov B., and Institut fiziologii (Ŭzbekiston SSR fanlar akademiîasi), eds. Sintez, membranoaktivnye svoĭstva i biologicheskie ėffekty kraun-ėfirov. Izd-vo "Fan" Uzbekskoĭ SSR, 1987.

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Book chapters on the topic "Crown ether synthesis"

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Wessner, D., J. C. G. Bünzli, F. Dunbar, and G. R. Choppin. "Lanthanoid Crown Ether Complexes." In Inorganic Syntheses. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132548.ch29.

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An, Na, Aaron M. Fleming, Nicole C. Rosecrans, Yi Liao, and Cynthia J. Burrows. "Synthesis of Site-Specific Crown Ether Adducts to DNA Abasic Sites: 8-Oxo-7,8-Dihydro-2′-Deoxyguanosine and 2′-Deoxycytidine." In Methods in Molecular Biology. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9216-4_2.

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Botti, P., H. L. Ball, P. Lucietto, M. Pinori, and P. Mascagni. "Crown ethers and peptide synthesis." In Peptides 1994. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-1468-4_56.

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Dutton, Philip J., Thomas M. Fyles, and Steven P. Hansen. "Polycarboxylate Crown Ethers: Synthesis, Complexation, Applications." In United States-Japan Seminar on Host-Guest Chemistry. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0969-4_20.

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Bulut, Mustafa, Birsen Yılmaz, and Çakıl Erk. "Synthesis of Isoflavone Derivatives of Crown Ethers." In Molecular Recognition and Inclusion. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5288-4_37.

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Ostaszewski, Ryszard. "Anthracene Crown Ethers: Synthesis and Complexation of Selected Cations." In Molecular Recognition and Inclusion. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5288-4_79.

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Maillard, B., M. J. Bourgeois, R. Lalande, and E. Montaudon. "Induced Decomposition of Peroxycompounds in Synthesis: Free Radical Functionalization of Crown Ethers." In Free Radicals in Synthesis and Biology. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0897-0_21.

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Sousa, L. R., B. Son, T. E. Trehearne, et al. "Synthesis and Study of Crown Ethers with Alkali-Metal-Enhanced Fluorescence." In ACS Symposium Series. American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1993-0538.ch002.

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Bozkurtoğlu, Neval, and Çakıl Erk. "The Synthesis and Conformational Analyses of Some Dibenzo[3n+2]Crown-n Ethers." In Molecular Recognition and Inclusion. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5288-4_35.

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Bulut, M., and Ç. Erk. "The Synthesis of Some Coumestan and Related Chromogenic Derivatives of Crown Ethers, Part II." In Molecular Recognition and Inclusion. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5288-4_38.

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Conference papers on the topic "Crown ether synthesis"

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Akopova, Olga, Anatoly Alexandrov, Tamara Pashkova, Lubov Kotovicz, Alexandr Kurnosov, and Adam Krowczynski. "Synthesis and mesophase studies of crown ether derivatives." In Liquid Crystals, edited by Marzena Tykarska, Roman S. Dabrowski, and Jerzy Zielinski. SPIE, 1998. http://dx.doi.org/10.1117/12.301252.

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Lucio Martinez, Fatima, Paula Munín, Francisco Reigosa, et al. "Design and Synthesis of Crown Ether Thiosemicarbazones." In The 20th International Electronic Conference on Synthetic Organic Chemistry. MDPI, 2016. http://dx.doi.org/10.3390/ecsoc-20-e013.

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Lucio Martinez, Fatima, Jose M. Vila, Francisco Reigosa, Paula Munín, Juan Manuel Ortigueira, and Mª Teresa Pereira. "Synthesis and reactivity of a new type of crown ether thiosemicarbazone." In The 22nd International Electronic Conference on Synthetic Organic Chemistry. MDPI, 2018. http://dx.doi.org/10.3390/ecsoc-22-05686.

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Chang, S. H., T. J. Ka, J. Y. Kim, A. S. Yeon, H. H. Nam, and G. S. Che. "Syntheses of new Bis-crown ethers based on siloxane." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835746.

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Nakamura, T., K. Honda, A. E. Underhill, A. T. Coomber, and R. H. Friend. "Ni(dmit)/sub 2/ salts of group-i-cation-including crown ethers." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835469.

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Reports on the topic "Crown ether synthesis"

1

Moyer, Bruce A. DESIGN AND SYNTHESIS OF THE NEXT GENERATION OF CROWN ETHERS FOR WASTE SEPARATIONS: AN INTER-LABORATORY COMPREHENSIVE PROPOSAL. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/827375.

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2

Moyer, B. A., M. L. Dietz, S. D. Alexandratos, and B. P. Hay. Design and synthesis of the next generation of crown ethers for waste separations: An interlaboratory comprehensive proposal. 1997 annual progress report. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/13741.

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3

Moyer, B. A., B. P. Hay, M. L. Dietz, S. D. Alexandratos, R. A. Sachleben, and R. Chiarizia. Design and synthesis of the next generation of crown ethers for waste separations: An inter-laboratory comprehensive proposal. 1998 annual progress report. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/13742.

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