A Congested Ru(dps)2 or Ru(dprs)2 Core (dps = di-2-pyridyl sulfide; dprs = di-2-pyrimidinyl sulfide) Promotes Sulfur Inversion ofN,S-Chelate Thioethers Containing CH2R and 2-Pyridyl or 2-Pyrimidinyl Groups
作者:Giuseppe Tresoldi、Sandra Lo Schiavo、Santo Lanza、Paola Cardiano
DOI:10.1002/1099-0682(20021)2002:1<181::aid-ejic181>3.0.co;2-g
日期:2002.1
barriers (ΔG‡298 K) for the dprs complexes are in the 54.9−53.8 kJ mol−1 range, with the two invertomers exhibiting similar abundance. Substitution of dprs with dps affects the relative invertomer population leaving the magnitude of ΔG‡298 K (52.0−50.6 kJ mol−1) practically unchanged. Conversely, the substitution of the pyridine thioethers (L1, L2) with pyrimidine thioethers (L5, L6) influences the inversion
硫醚 L [L = 4-甲基苄基 2-吡啶基硫醚 (L1), 4-氯苄基 2-吡啶基硫醚 (L2), 3-氯苄基 2-吡啶基硫醚 (L3), 1,4-双(2-吡啶基硫代甲基)苯(L4)、4-甲基苄基2-嘧啶基硫化物(L5)和4-氯苄基2-嘧啶基硫化物(L6)],含有与硫原子键合的CH2R基团,并被制备和表征。化合物 L1、L2、L3 和 L4 与顺式-Ru(N,N-dprs)2Cl2 或顺式-Ru(N,N-dps)2Cl2(dprs = 二-2-嘧啶基硫醚,dps = di-2-吡啶硫醚)导致复合物 [Ru(N,N-dprs)2(N,SL)][PF6]2 和 [Ru(N,N-dps)2(N,SL)][PF6]2。从 [Ru(N,N-dps)2(NO2)(NO)][PF6]2 和 L5 或 L6 获得类似的产物。由于 L 配体 N,S-螯合,所有配合物都含有四元环 RuSCN(Ru-N)。由于钌和硫原子是立体中心,Δ和Λ,和