| 摘要 |
Compounds of formula (I), wherein R1 is an optionally substituted 2alkylphenoxy group, each of R2, 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 R1 and R2 is 2-isopropyl-4-tert-nonylphenoxy and each of R3 and R4 is phenyl and the compound wherein R1 is 2methyl-4-tert-nonylphenoxy, R2 is 2,4-dimethylphenoxy and each of R3 and R4 is phenyl. Compounds of formula (I) are useful for the solvent extraction of metals, especially zinc from aqueous solution.
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