| 摘要 |
<p>The present invention relates to a large scale, non-chromatographic purification of chromogenic cryptahemispherands or lithium cryptahemisperaplexes which incorporate diaza-12-crown-4, diaza-14-crown-4 and diaza-15-crown-5 subunits and which are highly selective in binding of sodium ion in aqueous media.</p> |
