The hydrosulfido-bridged diiridium complex [Cp*Ir(μ-SH)3IrCp*]Cl 2 (Cp* =
η5-C5Me5) reacted with an excess of CH2CHX (X = COMe, SO2Ph, COOMe, CN) in the presence of NEt3 (4 equiv) in MeCN to afford the diiridium complexes [Cp*Ir(μ-SCH2CH2X)3IrCp*]Cl 4, which contain three bridging thiolato ligands derived from the Michael addition of the μ-SH ligands in 2 to the activated alkenes. In contrast, when only 2 equiv of CH2CHX (X = SO2Ph, CN) were allowed to react with 2 under analogous conditions, sulfidoâthiolato complexes [Cp*Ir(μ-S)(μ-SCH2CH2X)2IrCp*] 5 were obtained exclusively. Reaction of 5d (X = CN) with neat ClCH2CH2Cl and that of 2 with CH2CHCN in ClCH2CH2Cl in the presence of NEt3 both gave a mixed-thiolato complex [Cp*Ir(μ-SCH2CH2Cl)(μ-SCH2CH2CN)2IrCp*]Cl 6. Diiridium complexes with bridging dithiolato ligands were also obtainable from 2, which include [Cp*Ir(μ-SCH2CH2S)(μ-SCH2CH2Cl)IrCp*]Cl 7 from the reaction with ClCH2CH2Cl/NEt3 along with [Cp*Irμ-SCH2CH2CH(OH)S}(μ-SCH2CH2CHO)IrCp*]Cl and [Cp*Irμ-SCHPhCH2CH(OH)S}(μ-S)IrCp*] 9 afforded by treatment with α,β-unsaturated aldehydes CH2CHCHO and PhCHCHCHO, respectively. Reaction of 2 with ethylene sulfide in the presence of NEt3 also yielded a diiridium complex with bridging dithiolato ligands [Cp*Ir(μ-SCH2CH2S)2IrCp*] 10. Detailed structures have been determined by X-ray analyses for 4b (X = SO2Ph), 5d, 9, and 10, as well as the PF6 salts of 6 and 7.
氢
硫桥联二
铱络合物 [Cp*Ir(μ-SH)3IrCp*]Cl2 (Cp* = η5-C5Me5) 在 MeCN 中与过量的 CH2CHX (X = COMe, SO2Ph, COOMe, CN) 反应,并加入 NEt3(4 等量),生成含有三个由 2 中的 μ-SH
配体与活化烯烃的迈克尔加成反应生成的桥联
硫醇
配体的二
铱络合物 [Cp*Ir(μ-SCH2CH2X)3IrCp*]Cl4。相反,当只有 2 等量的 CH2CHX (X = SO2Ph, CN) 在类似条件下与 2 反应时,独占性地得到
硫氟-
硫醇络合物 [Cp*Ir(μ-S)(μ-SCH2CH2X)2IrCp*] 5。5d (X = CN) 与清洁的 ClCH2CH2Cl 反应,以及 2 在 NEt3 存在下与 CH2CHCN 在 ClCH2CH2Cl 中的反应均给出混合
硫醇络合物 [Cp*Ir(μ-SCH2CH2Cl)(μ-SCH2CH2CN)2IrCp*]Cl 6。与桥联二
硫醇
配体的二
铱络合物也可以从 2 中获得,其中包括来自 ClCH2CH2Cl/NEt3 反应的 [Cp*Ir(μ-SCH2CH2S)(μ-SCH2CH2Cl)IrCp*]Cl 7,以及通过与 α,β-不饱和醛 CH2CHCHO 和 PhCHCHCHO 加工而成的 [Cp*Irμ-SCH2CH2CH(OH)S}(μ-SCH2CH2CHO)IrCp*]Cl 和 [Cp*Irμ-SCHPhCH2CH(OH)S}(μ-S)IrCp*] 9。2 与
乙烯硫化物在 NEt3 存在下的反应也得到了一种具有桥联二
硫醇
配体的二
铱络合物 [Cp*Ir(μ-SCH2CH2S)2IrCp*] 10。通过 X 射线分析已确定 4b (X = SO2Ph)、5d、9 和 10 的详细结构,以及 6 和 7 的 PF6 盐的结构。