Synthesis, Structure, and Reactivity of Co(II) and Ni(II) PCP Pincer Borohydride Complexes
作者:Sathiyamoorthy Murugesan、Berthold Stöger、Matthias Weil、Luis F. Veiros、Karl Kirchner
DOI:10.1021/acs.organomet.5b00075
日期:2015.4.13
The borohydride ligand is symmetrically bound to the cobalt center in eta2-fashion. These compounds are paramagnetic with effective magnetic moments of 2.0(1) and 2.1(1) muB consistent with a d7 low-spin system corresponding to one unpaired electron. None of these complexes reacted with CO2 to give formate complexes. For structural and reactivity comparisons, we prepared the analogous Ni(II) borohydride
chiral R2PCl compounds in the presence of base. PCP complexes of Ni(II), Ni(PCP)Cl, were synthesized by the reaction of NiCl2·6H2O with 1 equiv of a PCP ligand. In similar fashion, treatment of M(COD)X2 (M = Pd, Pt; X = Cl, Br) with 1 equiv of a PCP ligand yields the square-planar complexes M(PCP)X. Palladium PCP complexes featuring a coordinated TFA ligand (TFA = CF3COO-) are obtained by the reaction
A PNCNP pincer-ligated platinum(II) chloride complex [2,6-(tBu2PNH)2C6H3]PtCl (1a) was synthesized and fully characterized. Complex 1a was applied to the catalytic hydrosilylation of unsaturated carbon-heteroatom bonds. For comparison, the corresponding hydride complex [2,6-(tBu2PNH)2C6H3]PtH (1b) and the related POCOP pincer chloride complex [2,6-(tBu2PO)2C6H3]PtCl (1c) were also used to catalyze
合成并充分表征了 PNCNP 钳连接的氯化铂 (II) 络合物 [2,6-( t Bu 2 PNH) 2 C 6 H 3 ]PtCl ( 1a )。络合物1a应用于不饱和碳-杂原子键的催化氢化硅烷化。为了比较,相应的氢化物络合物 [2,6-( t Bu 2 PNH) 2 C 6 H 3 ]PtH ( 1b ) 和相关的 POCOP 钳形氯络合物 [2,6-( t Bu 2 PO) 2 C 6 H 3 ]氯化铂(1c ) 也用于催化反应。发现1a是 C=O 和 C=N 键氢化硅烷化的良好催化剂。范围广泛的醛亚胺、酮亚胺、醛和酮被氢化硅烷化,并以良好至优异的收率获得预期的胺或醇产物。该反应还具有良好的官能团相容性。络合物1a代表了最有效的 C=N 键氢化硅烷化过渡金属催化剂,并且是 C=O 键氢化硅烷化的最佳过渡金属催化剂之一。这些反应可能由反应过程中由络合物1a生成的阳离子铂 (II) 物种催化。
Synthesis, Characterization, and Catalytic Properties of Iridium Pincer Complexes Containing NH Linkers
作者:Reuben B. Leveson-Gower、Paul B. Webb、David B. Cordes、Alexandra M. Z. Slawin、David M. Smith、Robert P. Tooze、Jianke Liu
DOI:10.1021/acs.organomet.7b00713
日期:2018.1.8
hydridochloro complexes (tBu4PXCYP)IrHCl (2e, X = Y = NH; 2f, X = NH; Y = O) were prepared with moderate yields and high purity and were fully characterized by 1H and 31P NMR spectroscopy. Unsymmetrical hybrid pincer ligands R2PNCOPtBu2 (1g, R = isopropyl; 1h, R = cyclohexyl) were prepared conveniently in high yield via a one-pot procedure by judiciously choosing reaction conditions and base; the corresponding
基于1,3-二氨基苯和3-氨基酚骨架的一系列叔丁基取代的钳位配体,tBu4 PXCYP(1e,X = Y = NH; 1f,X = NH; Y = O)和相应的铱氢化氯络合物(tBu4 PXCYP)IrHCl(2e,X = Y = NH; 2f,X = NH; Y = O)的制备具有中等收率和高纯度,并通过1 H和31 P NMR光谱进行了全面表征。不对称杂种钳配体R2 PNCOP tBu2(1g,R =异丙基; 1h通过明智地选择反应条件和碱,通过一锅法方便地以高收率制备R,(R =环己基)。通过[IrCl(COE)2 ] 2与配体的反应合成了相应的铱氢化氯络合物iPr2 PNCOP tBu2 IrHCl(2g)和Cy2 PNCOP tBu2 IrHCl(2h)。X射线晶体学表明,这些铱钳形配合物采用相似的正方形-金字塔形几何形状,并且在固态下,相邻的铱配合物的NH连接子和氯离子之间显示出很强的分子间氢键。叔丁基的1