Synthesis and characterization of Pd(IMe)2, and its reactivity by C–S oxidative addition of DMSO
作者:Eunsung Lee、Dmitry V. Yandulov
DOI:10.1016/j.jorganchem.2011.07.006
日期:2011.12
Two-electron reduction of PdX2(NHC)2 with Groups 1, 2 metals (K, Mg) is a convenient route to Pd(NHC)2 complexes including Pd(IMe)2 (2a), isolated and crystallographically characterized as the least sterically encumbered d10 M(0)L2 species to date. 2a exhibits a regular linear geometry and modest Lewis acidity to coordinating solvents and additional IMe. In contrast to its analogs with bulkier NHC = ItBu
PdX 2(NHC)2与第1、2族金属(K,Mg)的两电子还原是通往包括Pd(I Me)2(2a)在内的Pd(NHC)2络合物的便捷途径,该化合物经分离和晶体学表征为迄今为止,在空间上受到最少限制的d 10 M(0)L 2种。2a表现出规则的线性几何结构,并且对配位溶剂和额外的I Me具有适度的Lewis酸度。与之类似,NHC = I t Bu和I Pr较大的类似物 ,2a进行DMSO的Me-S(O)Me键的净净氧化加成,在室温下形成反式-PdMe(S(O)Me)I Me 2(3)。DFT计算表明该反应由取代继续我通过我κS-DMSO,随后一致Ç - S氧化加成到的Pd与单个我Me中,用大约一个偏好10千卡在有效ΔG/摩尔。小号‡在直接途径。计算还确定了两个简便的分子内途径,使硫磺上的Pd(II)甲基亚磺酰基络合物消旋。