<i>Para</i>-Quinone-Containing Bis(pyrazol-1-yl)methane Ligands: Coordination Behavior Toward Co<sup>II</sup> and a C−H Activation Reaction with Ce<sup>IV</sup>
作者:Florian Blasberg、Jan W. Bats、Michael Bolte、Hans-Wolfram Lerner、Matthias Wagner
DOI:10.1021/ic100754k
日期:2010.8.16
para-benzoquinonyl-substituted bis(pyrazol-1-yl)methane ligands L4Ph and L4tBu. Contrary to that, the methylderivative L3Me2 is transformed into the ortho-benzoquinone species L5Me2, which still contains one methoxy substituent while one oxygen atom has been newly introduced. The formation of L5Me2 requires (i) the admission of air, (ii) the presence of both methoxy substituents of L3Me2, and (iii)
已经合成了两个系列的空间需求的对-二甲氧基苯基取代的双(吡唑-1-基)甲烷配体,即L2 R,R' =((MeO)2 C 6 H 3)C(H)(pz R, R')2和L3 R,R' =((MeO)2 C 6 H 3)C(Me)(pz R,R')2(R,R'= 3-Me,5-Me; 3-Ph ,5-H; 3- t Bu,5-H)。在固态下,已经空间位至少作保衍生物L2 ME2能够稳定钴II形式的配合物[X 2Co(L 2 Me 2)](X = Cl,NO 3); n =1。在溶液中,这些络合物与1:2的[Co(L2 Me2)2 ] 2+处于平衡状态。用[Ce(NH 4)2(NO 3)6 ]对L3 Ph和L3 t Bu进行氧化脱甲基反应,生成相应的对苯醌基取代的双(吡唑-1-基)甲烷配体L4 Ph和L4 t Bu。与此相反,甲基衍生物L3 Me2将其转化为邻苯甲醌类L5 Me2,它仍然含有一个甲氧基取代基,而新引入了一个氧原子。L5