作者:Mohammad A. Abdulmalic、Tobias Rüffer
DOI:10.1246/bcsj.20130031
日期:2013.6.15
1,1′-Diaminoferrocene (3) was conveniently synthesized by employing a Gabriel synthesis in two steps starting from 1,1′-dibromoferrocene (1). Compound 1 was reacted with 2.5 equivalents of phthalimide in the presence of Cu2O using 4-picoline as a solvent to give 1,1′-diphthalimidoferrocene (2) in a moderate yield. Hydrazinolysis of 2 in EtOH afforded 3 in good yields of ca. 70%. The subsequent reaction of 3 with two equivalents of ethyloxalyl chloride in THF gave the diethyl ester of N,N′-ferrocenylene bis(oxamic acid) (1,1′-fcbaH2Et2, 4). The solution obtained by treating 4 with two equivalents of n-Bu4NOH in H2O was added to a solution of Pd(AcO)2 in THF to give the palladium complex [n-Bu4N]2[Pd(1,1′-fcba)] (5) in ca. 80% yield. The compounds 2–4 were characterized by 1H, 13C NMR and IR spectroscopy as well as elemental analysis and the heterobinuclear complex 5 by 1H NMR and IR spectroscopy, elemental analysis and by a single-crystal X-ray diffraction study.
1,1′-二氨基铁烯 (3) 通过两步加贝里尔合成法方便地合成,起始原料为1,1′-二溴铁烯 (1)。化合物 1 在 Cu2O 存在下与 2.5 当量的邻苯二甲酰亚胺反应,使用 4-吡啶作为溶剂,得到 1,1′-二邻苯二甲酰亚胺铁烯 (2),产率较为适中。化合物 2 在乙醇中的肼水解反应提供了良好产率约为 70% 的化合物 3。随后,化合物 3 与两当量的乙氧基草酸氯化物在四氟化碳中反应,生成 N,N′-铁烯基双(草酰胺) 的二乙酯 (1,1′-fcbaH2Et2, 4)。用两当量的四丁基氢氧化铵在水中处理 4 得到的溶液,加入四氟化碳中 Pd(AcO)2 的溶液,获得钯络合物 [n-Bu4N]2[Pd(1,1′-fcba)] (5),产率约为 80%。化合物 2-4 通过 1H 和 13C 核磁共振及红外光谱,以及元素分析进行表征,而异核复合物 5 则通过 1H 核磁共振和红外光谱、元素分析及单晶 X 射线衍射研究进行了表征。