- Synthesis of Substituted 14-Crown-4 Compounds
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Seventeen new substituted 14-crown-4 derivatives 3-10, 35-40, 42, 45 and 46 are described.A series of nine compounds 2-10 with two, three or four substituents in the 6- and/or 13-positions was synthesized in good yields from the appropriate diols and ditosylates using improved cyclization conditions.The solid state structures of 6,6,13,13-tetra(benzyloxymethyl)-14-crown-4 (8) and lithium thiocyanate complexes of trans- and cis-6,13-bis(spiro-2,2-dichlorocyclopropyl)-14-crown-4 (45) and (46), respectively, have been determined.
- Czech, Bronislaw P.,Zazulak, Wolodymyr,Kumar, Anand,Olsher, Uriel,Feinberg, Hadar,et al.
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p. 1389 - 1400
(2007/10/02)
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- Synthesis and Selectivity for Lithium of Lipophilic 14-Crown-4 Derivatives bearing Bulky Substituents or an Additional Binding Site in the Side Arm
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Two types of 6,6-disubstituted 14-crown-4 (1,4,8,11-tetraoxacyclotetradecane) derivatives have been synthesized in the hope of improving on the selectivity of the parent macrocycle for Li(1+), especially against Na(1+) and K(1+).Selectivity enchancement w
- Kimura, Keiichi,Yano, Hideki,Kitazawa, Sadaya,Shono, Toshiyuki
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p. 1945 - 1952
(2007/10/02)
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