大空间位阻β-二亚胺镁配合物的合成、晶体结构及硅氢化反应（英文）

Sterically Bulky β-Diketiminate Magnesium Complexes: Syntheses,Crystal Structure and Catalytic Hydrosilylation

2,4-戊二酮分别与不同的伯胺反应,合成出2种新的大空间位阻的β-二亚胺配体。其中β-二亚胺配体1与格氏试剂甲基碘化镁(Me Mg I)反应得到相应四配位镁的甲基配合物,配体1的锂盐与溴化镁(Mg Br2)反应制备出Mg-Li双金属溴配合物。新β-二亚胺配体和相应镁的甲基配合物和溴配合物的晶体结构均通过单晶X射线衍射确定,相应镁的甲基配合物和溴配合物在苯乙酮的硅氢化反应中显示了较好的催化活性。

Two new sterically bulky β-diketiminate compounds CH（C（Me）N（2,6-CHPh2-4-iPrC6H2））2H （1） and （CH（C（Me）N（2,4-C（CH3）3C6H2））2H （2） were synthesized by the reaction of 2,4-pentanedione with the corresponding primary amines. Treatment of ligand 1 with Grignard reagent MeMgI in THF provided a four-coordinated magnesium methyl complex. The lithium salt of 1 was subsequently reacted with MgBr2 in THF to yield the Mg-Li bimetallic magnesium bromide complex. The molecular structures of two β-diketiminate ligands and their corresponding magnesium methyl and bromide complexes have been characterized using X-ray crystallography. The corresponding magnesium methyl and bromide complexes have shown moderate catalytic activity in the hydrosilylation of acetophenone.