Lariat ethers with a novel proton-ionizable group. Synthesis andsolvent extraction of alkali metal cations
Chemical Communications（1997）
摘要
Novel lariat ethers with pendent N-alkyl- and
N-aryl-sulfonyl carbamoyl groups are synthesized in two steps
from sym-(decyl)dibenzo-16-crown-5-oxyacetic acid; for
competitive solvent extraction of alkali metal cations from aqueous
solutions into chloroform by these proton-ionizable lariat ethers with
‘tunable’ acidity, the selectivity order is
Na
+
>>K
+
with no detectable extraction of
Li
+
, Rb
+
or Cs
+
.
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