A six-membered cycloaurated complex [AuCl2(pcp-C1,N)] [pcp = 2-(2-pyridylcarbonyl)phenyl] has been prepared by the reaction between the adduct [AuCl3(Hpcp)] (Hpcp = 2-benzoylpyridine) and AgO2CCF3, and its structure determined by X-ray diffraction. The boat-like conformation of the six-membered pcp–Au ring has been compared to that of the pmp–Au ring in [AuCl(pmp-C1,N)(PPh3)]BF4 [pmp = 2-(2-pyridylmethyl)phenyl] the structure of which has also been established by X-ray diffraction. The complex [AuCl2(pcp-C1,N)] reacts with PPh3 in a 1∶1 molar ratio to give a neutral complex [AuCl2(pcp)(PPh3)]. This is further converted into trans-[AuCl(pcp)(PPh3)2]BF4 and [Au(pcp-C1,N)2]BF4 by treating with PPh3 in the presence of NaBF4 and excess of AgBF4, respectively. This reactivity towards triphenylphosphine has been compared with that of the known cycloaurated complex [AuCl2(pmp-C1,N)]. Temperature-dependent 1H NMR spectra attributable to inversion of the six-membered pmp–Au ring have been observed and the rates of inversion measured by line shape analysis of the methylene protons in [AuCl(pmp-C1,N)(PPh3)]BF4.
通过加合物 [AuCl3(Hpcp)](Hpcp = 2-苯甲酰基
吡啶)与 AgO2CCF3 的反应,制备了六元环状复合物 [AuCl2(pcp-C1,N)] [pcp = 2-(2-
吡啶基羰基)苯基],并通过 X 射线衍射测定了其结构。六元 pcp-Au 环的舟状构象与 [AuCl(pmp-C1,N)(PPh3)]BF4 [pmp = 2-(2-
吡啶甲基)苯基] 中 pmp-Au 环的舟状构象进行了比较,后者的结构也已通过 X 射线衍射确定。复合物 [AuCl2(pcp-C1,N)]以 1∶1 的摩尔比与 PPh3 反应,生成中性复合物 [AuCl2(pcp)(PPh3)]。在 NaBF4 和过量
AgBF4 的存在下,通过与 PPh3 的反应,[AuCl2(pcp)(PPh3)]进一步转化为反式[AuCl(pcp)(PPh3)2]BF4 和[Au(pcp-C1,N)2]BF4。这种对
三苯基膦的反应性与已知环aurated 复合物 [AuCl2(pmp-C1,N)]的反应性进行了比较。通过对 [AuCl(pmp-C1,N)(PPh3)]BF4中亚甲基质子的线形分析,观察到了可归因于六元 pmp-Au 环反转的随温度变化的 1H NMR 光谱,并测量了反转的速率。