metathesis and coordination. The electronic structure of 1 was investigated by electron paramagnetic resonance (EPR) measurements, revealing the presence of a Ti(III) center and one [OC]•– radical anion. In contrast, the diamagnetic complex 2 was found to comprise a Zr(IV) center and an alkyl/aryloxo dianion. Divergent catalytic reactivity was observed for the two group 4 derivatives in the reaction between
第 4 族茂
金属配合物 CP 2 M[OC] (CP = η 5 -C 5 H 5 ; M = Ti ( 1 ) 或 Zr ( 2 ); [OC] = κ 2 - O , C -OC 6 H 2 -2 -CPh 2 -4,6- t Bu 2 )通过盐复分解成功合成了负载有氧化还原活性的二齿O , C-
配体。X 射线晶体学结果表明,两种配合物都保持相似的弯曲茂
金属配位几何结构。对结构参数的仔细检查揭示了一个非常长的 Ti-C 键1,表明在复分解和配位时伴随的分子内电荷转移。通过电子顺磁共振(EPR) 测量研究了1的电子结构,揭示了Ti(III) 中心和一个[OC] •–自由基阴离子的存在。相反,发现抗磁性络合物2包含Zr(IV)中心和烷基/芳氧基双阴离子。在烯烃和 HBpin 的反应中,观察到两个第 4 组衍
生物的催化反应不同。具体来说,脱氢
硼化产物(即,
乙烯基硼酸酯) 仅在 Zr 配合物存在下获得