Synthesis, characterization and reactivity of vanadium, chromium, and manganese PNP pincer complexes
作者:Matthias Mastalir、Mathias Glatz、Berthold Stöger、Matthias Weil、Ernst Pittenauer、Günter Allmaier、Karl Kirchner
DOI:10.1016/j.ica.2016.02.064
日期:2017.1
a preliminary study, these complexes catalyze the oxidative homo-coupling of aryl Grignard reagents in the presence of MeI as oxidizing agents to give symmetrical biaryls, but are inactive in Kumada cross-coupling reactions. The reactivity of V(III), Cr(III), Cr(II) and Mn(II) is compared with related Fe(II) and Co(II) complexes of the types [Fe(PNP-iPr)Cl2], and [Co(PNP-iPr)Cl2]. In all cases, good
报道了一系列[M(PNP)Cl3](M = V,Cr)和[M(PNP)Cl2](M = Cr,Mn)类型的钒,铬和锰PNP配合物的合成。钒和锰PNP钳形复合物首次被描述。所有配合物的特征均在于其磁矩,元素分析和ESI MS。此外,某些化合物的特征在于X射线晶体学。在初步研究中,这些络合物在存在作为氧化剂的MeI的情况下催化芳基格氏试剂的氧化均偶联,以产生对称的联芳基,但在Kumada交叉偶联反应中没有活性。将V(III),Cr(III),Cr(II)和Mn(II)的反应性与[Fe(PNP-iPr)Cl2]类型的相关Fe(II)和Co(II)配合物进行比较,并[Co(PNP-iPr)Cl2]。在所有情况下,都能获得良好的分离产率。然而,