Strongly basic macrocyclic triamines, 1,5,9-triazacyclododecanes for solvent extraction of gold(I) cyanide
作者:Heung-Jin Choi、Yoon-Kyung Bae、Seok-Chan Kang、Yeon Sil Park、Joon Won Park、Woong-Il Kim、Thomas W Bell
DOI:10.1016/s0040-4039(02)02322-5
日期:2002.12
Solvent extraction of gold(I) dicyanide anion from alkaline gold(I) cyanide solution using unusually basic amine extractants was conducted. 1,5,9-Triazacyclododecane (4) is known as an unusually basic macrocyclic amine having pKa=12.3–12.7, and is thus a good candidate as a basic amine extractant. Three lipophilic derivatives of 4 expected to stay in the organic phase during gold solvent extraction were
使用不同寻常的碱性胺萃取剂从碱性氰化金(I)溶液中溶剂萃取了二氰化金(I)阴离子。1,5,9-三氮杂环十二烷(4)被称为具有p K a = 12.3-12.7的异常碱性大环胺,因此是碱性胺萃取剂的良好候选者。合成了三种预计在金溶剂萃取过程中保留在有机相中的亲脂性衍生物4。Ñ十二烷基-1,5,9-三氮杂(3)从1,5,9-三氮杂-2,4-二酮(其制备1通过N-烷基化)与Ñ十二烷基碘,然后用BH还原3 -THF 。ñ,Ñ '-Didodecyl-1,5,9-三氮杂(5)和Ñ,Ñ ',Ñ '-tridodecyl-1,5,9-三氮杂(6)被有效地选择性二烷基化合成4用ñ -十二烷基碘化物,并通过分别与正十二碳烯醛的4还原烷基化。萃取剂3和6的pH 50= 10.5,这是实际应用所需的最小值。