Ring-closure reactions. 19. Kinetics of formation of benzo-crown ethers by intramolecular nucleophilic substitution. A comparison between polyoxyethylene and polymethylene chains
Template effects. 6. The effect of alkali metal ions on the formation of benzo-3x-crown-x ethers over a wide range of ring sizes
作者:Luigi Mandolini、Bernardo Masci
DOI:10.1021/ja00313a034
日期:1984.1
La vitesse de formation des ethers benzo-3n-crown-n avec n=4,5,7,10 et 16 via alkylation intramoleculaire de o- − OC 6 H 4 (OCH 2 CH 2 ) x−1 Br dans le DMSO aqueux a 99% est enormement modifiee par l'addition de bromures de metaux alcalins
La vitesse de Formation des ethers benzo-3n-crown-n avec n=4,5,7,10 et 16 via烷基化分子内 de o- − OC 6 H 4 (OCH 2 CH 2 ) x−1 Br dans le DMSO aqueux a 99% est enormement modifiee par l'addition de bromures de metaux alcalins
Template effects. 8. The template effect of two alkali metal ions in the formation of crown ethers
作者:Chiara Antonini Vitali、Bernardo Masci
DOI:10.1016/s0040-4020(01)80081-8
日期:1989.1
supporting a template effect of two alkali metal ions in the formation of coronands, the formation of 21- to 30-membered benzo-crown ethers has been investigated kinetically at varying KC104 concentrations in a mixed solvent (dioxane/99% Me2SO 2:1). Besides the clean-cut appearance of two catalytic waves in the formation of benzo[30]crown-10, evidence is reported for the involvment of a second K+ ion also