74262-29-6Relevant academic research and scientific papers
STEREODESIGN OF CROWN ETHERS. I. SYNTHESIS AND (13)C NMR STUDY OF TRANS- CYCLOHEXANOCROWN ETHERS
Samoshin, V. V.,Zelenkina, O. A.,Subbotin, O. A.,Sergeev, N. M.,Zefirov, N. S.
, p. 413 - 418 (2007/10/02)
A series of trans-cyclohexanocrown ethers were synthesized by the intermolecular cyclization of polyethylene glycol trans-2-hydroxycyclohexyl ethers with the ditosyl derivatives of polyethylene glycols.A complete assignment of the signals in the (13)C NMR spectra was made for the obtained compounds.
Synthesis of Diethyl, Di-n-octyl, and Mono- and Dicyclohexano Macrocyclic Polyether-Diester Ligands
Jolley, Scott T.,Bradshaw, Jerald S.
, p. 3554 - 3559 (2007/10/02)
Three series of macrocyclic polyether-diester ligands have been prepared from the reaction of four diethyloligoethylene glycols, 24-27, di-n-octyltetraethylene glycol 28, and mono- and dicyclohexanotetraethylene glycols 29 and 30 with diglycolyl dichloride (products 6-11b), thiadiglycolyl dichloride (products 12-17), and 2,6- pyridinedicarbonyl chloride (products 18-23).Compounds 11 and 17 formed trans-syn-trans and trans-anti-trans isomers, and in the case of compound 11 these isomers were isolated and characterized.The 18-membered-ring compounds 7, 22, and 23 formed solid potassium thiocyanate complexes.
Synthesis of Substituted Crown Ethers from Oligoethylene Glycols
Ikeda, Isao,Yamamura, Shingo,Nakatsuji, Yohji,Okahara, Mitsuo
, p. 5355 - 5358 (2007/10/02)
A convenient synthetic method for preparing 12-crown-4, 15-crown-5, 18-crown-6, and 21-crown-7 bearing various substituents by intramolecular cyclization of the corresponding substituted oligoethylene glycols in high yields is described.Substituents include modifiable pendent groups such as phenyl and hydroxymethyl, as well as various alkyl groups.Stability constants for the new substituted crown ethers with sodium and potassium ions in methanol were determined by potentiometric titration.The absolute effect of pendent groups on stability constants was insignificant.
