Diazahexathia-24-crown-8 (2) has been isolated from the reaction mixture during the preparation of monoazatrithia-12-crown-4 (1). When N-Boc protected bis(2-chloroethyl)amine was employed as a starting material, N-Boc protected monoazatrithia-12-crown-4 (3) and N-Boc protected diazahexathia-24-crown-4 (4) were separated easily. Double-armed diazahexathia-24-crown-8 having two 3′,5′-dichlorobenzyl groups (5a) or two 2-phenylethyl groups (5b) were also prepared using reductive amination. The stoichiometry and detailed structures of the Ag+ complexes with 5a and 5b were investigated by 1H NMR titration experiments and X-ray crystallography.
在制备单氮杂
三亚乙基四胺-
12-冠-4(1)的过程中,从反应混合物中分离出了二氮杂六亚乙基四胺-24-冠-8(2)。当使用N-Boc保护的双(2-
氯乙基)胺作为起始材料时,可以轻松分离出N-Boc保护的单氮杂
三亚乙基四胺-
12-冠-4(3)和N-Boc保护的二氮杂六亚乙基四胺-24-冠-4(4)。通过还原胺化反应,还制备了具有两个3′,5′-二
氯苄基(5a)或两个2-苯乙基(5b)的双臂二氮杂六亚乙基四胺-24-冠-8。通过1H NMR滴定实验和X射线晶体学研究了Ag+与5a和5b配合物的
化学计量和详细结构。