| 摘要 |
<p>Compounds of formula (I), wherein R1 is an optionally substituted 2-alkylphenoxy group, each of R?2, R3 and R4¿ is a group selected from optionally substituted 2-alkylphenoxy, optionally substituted phenyl, optionally substituted alkyl and optionally substituted alkoxy and at least one optionally substituted 2-alkylphenoxy group has a tertiary alkyl substituent except the compound wherein each of R?1 and R2¿ is 2-isopropyl-4-tert-nonylphenoxy and each of R?3 and R4¿ is phenyl and the compound wherein R1 is 2-methyl-4-tert-nonylphenoxy, R2 is 2,4-dimethylphenoxy and each of R?3 and R4¿ is phenyl. Compounds of formula (I) are useful for the solvent extraction of metals, especially zinc from aqueous solution.</p> |
