Record number :
1659621
Title of article :
Strongly basic macrocyclic triamines, 1,5,9-triazacyclododecanes for solvent extraction of gold(I) cyanide
Author/Authors :
Choi، نويسنده , , Heung-Jin and Bae، نويسنده , , Yoon-Kyung and Kang، نويسنده , , Seok-Chan and Sil Park، نويسنده , , Yeon and Won Park، نويسنده , , Joon and Kim، نويسنده , , Woong-Il and Bell، نويسنده , , Thomas W، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2002
Pages :
5
From page :
9385
To page :
9389
Abstract :
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 synthesized. N-Dodecyl-1,5,9-triazacyclododecane (3) was prepared from 1,5,9-triazacyclododecane-2,4-dione (1) by N-alkylation with n-dodecyl iodide and then reduction with BH3-THF. N,N′-Didodecyl-1,5,9-triazacyclododecane (5) and N,N′,N′′-tridodecyl-1,5,9-triazacyclododecane (6) were efficiently synthesized by selective di-alkylation of 4 with n-dodecyl iodide, and by reductive alkylation of 4 with n-dodecanal, respectively. The extractants 3 and 6 showed pH50=10.5, which is the minimum value required for practical application.
Keywords :
gold leach solution , Solvent extraction , gold cyanide , 1 , pH50 , 9-triazacyclododecane , amine extractant , 5
Journal title :
Tetrahedron Letters
Journal title :
Tetrahedron Letters
Serial Year :
2002
Link To Document :
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