Syntheses of Sterically Bulky Schiff-Base Magnesium Complexes and Their Application in the Hydrosilylation of Ketones

详细信息    查看全文

• 作者：Mengtao Ma ; Xingchao Shen ; Weifan Wang ; Jia Li ; Weiwei Yao and Lijun Zhu
• 刊名：European Journal of Inorganic Chemistry
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：2016
• 期：31
• 页码：5057-5062
• 全文大小：1201K
• ISSN：1099-0682c

文摘

The sterically bulky Schiff-base ligand 1 (L¹H) was treated with CH₃MgI in toluene to give the unexpected homoleptic magnesium complex 2 (L¹MgL¹) in good yield. However, the reaction of sterically more bulky ligand 3 (L²H) with CH₃MgI in diethyl ether yielded the desired heteroleptic magnesium iodide 4 [L²MgI(OEt₂)], which was further reduced with sodium to produce the Mg–Na heterodimetallic complex 5. The crystal structures of all new magnesium complexes were determined by single-crystal X-ray diffraction. All new magnesium complexes have been investigated as catalysts for the hydrosilylation of ketones with (EtO)₃SiH. The study showed that catalytic activity of the Mg–Na dimetallic complex 5 is superior to those of monometallic magnesium complexes 2 and 4 and is applicable to a series of subatrates.