- CAPTODATIVE SUBSTITUENT EFFECTS - PART XXII. RADICAL DEHYDRODIMERISATION AND BRIDGED DEHYDRODIMERISATION OF MACROCYCLIC POLYETHERS
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Crown ethers are dehydrodimerized in good yields when treated with ditert.-butyl peroxide in UV light.Bridged dehydrodimers of crown ethers are obtained in the presence of α-tert.-butylmercaptoacrylonitrile.Cation extraction study was performed in order to compare the binding properties of dehydrodimers vs. monomers.
- Beaujean, M.,Mignani, S.,Merenyi, R.,Janousek, Z.,Viehe, H. G.
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- MACROHETEROCYCLES. XXXIII. BINUCLEAR CHIRAL CROWN ETHERS
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The condensation of (2S, 3S)-butane-1,2,3,4-tetrol with the ditosyl derivative of polyethylene glycol leads to mixtures of the structural isomers of binuclear chiral crown ethers.The individual compounds were isolated by chromatographic methods, and their structures were demonstrated by alternative synthesis and by their spectral data.The enantioselectivity in the complexation of the obtained compounds with the hydrochlorides of L- and D-valine methyl esters was determined by potentiometry.
- Luk'yanenko, N. G.,Lobach, A. V.,Lyamtseva, L. N.,Nazarova, N. Yu.,Karpenko, L. P.
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p. 284 - 290
(2007/10/02)
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- MACROCYCLES. 32. HOMOLYTIC DEHYDRODIMERIZATION OF CROWN ETHERS
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The corresponding bis(crown ethers), as well as phenyl- and hydroxy-substituted crown ethers, were obtained by homolytic dehydrodimerization of 12-crown-4, 15-crown-5, and 18-crown-6 in benzene or water.
- Luk'yanenko, N. G.,Lobach, A. V.,Parfenova, M. N.,Lyamtseva, L. N.,Timofeev, O. S.,Gren' A. I.
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p. 940 - 943
(2007/10/02)
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