Template effects. 7. Large unsubstituted crown ethers from polyethylene glycols: Formation, analysis, and purification
作者:Chiara Antonini Vitali、Bernardo Masci
DOI:10.1016/s0040-4020(01)80080-6
日期:1989.1
tri- to deca-ethylene glycol yields not only the corresponding crownethers but also higher cyclooligomers that can be analyzed up to about [60] crown-20 by glc: in particular [36] crown-12 and [48] crown-16 were obtained from tetraethylene glycol and purified by column chromatography on cellulose; iii) the reaction, as applied to commercial mixtures of polyethyleneglycols (from PEG 200 to PEG 1000)