triethylamine, the yield of 4a increased up to 44%. The complex 3 involves a pentaimino moiety [−C(NR)C(NR)}3CH(NR)] derived from a successive insertion of isocyanide into the palladium−hydride bond of trans-[Pd(H)Cl(PPh3)2] (2), which was generated from the reaction of 1 and H2SiMePh in situ. The pentaimino ligand attaches to the metal through the carbon atom of the α-imino group and the lone pair electron of
[PdCl 2(PPh 3)2 ](1)与过量的
2,6-二甲苯基异
氰化物(XylNC)和H 2 SiMePh在回流的
甲苯中反应,得到聚亚
氨基
配体[Pd C(NR)C(NR)C(NR)C(NR)CH(NR)}(C⋮NR)Cl]· 1 / 2 C 6 H 6(3 · 1 / 2 C 6 H 6:R = Xyl,30 %)和新型杂环
双环化合物2,6-(2',6'-二
甲苯基)2 -3,7-(N -2',6'-二
甲苯基)2-4,8-(N -2',6'-二
甲苯基
氨基)2 -
2,6-二氮杂双环[3.3.0] octa-4,8-二
烯(4a,15%),其结构由X-射线分析。当反应在
三乙胺存在下进行时,4a的产率增加至44%。配合物3包含一个五聚
氨基部分[-C(NR)C(NR)} 3 CH(NR)],该部分源自将
异氰酸酯连续插入反式-[Pd(H)Cl(PPh 3)的
钯-
氢化物键中)2 ](2),它是由1和H