Tandem deoxygenative hydrosilation of carbon dioxide with a cationic scandium hydridoborate and B(C6F5)3

被引:18
作者
Beh, Daniel W. [1 ]
Piers, Warren E. [1 ]
Gelfand, Benjamin S. [1 ]
Lin, Jian-Bin [1 ]
机构
[1] Univ Calgary, Dept Chem, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
SELECTIVE REDUCTION; CO2; CHEMISTRY; COMPLEXES; ACTIVATION; METHANE; HYDROSILYLATION; CATALYSIS; HYDRIDES;
D O I
10.1039/c9dt04323c
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A scandium hydridoborate complex supported by the dianionic pentadentate ligand B(2)Pz(4)Py is prepared via hydride abstraction from the previously reported scandium hydride complex with tris-pentafluorophenyl borane. Exposure of [(B(2)Pz(4)Py)Sc][HB(C6F5)(3)] to CO2 immediately forms [(B(2)Pz(4)Py)Sc][HCOOB(C6F5)(3)] at room temperature. The formatoborate complex can also be synthesized directly from the starting material (B(2)Pz(4)Py)ScCl with Et3SiH and B(C6F5)(3) while in the presence of an atmosphere of CO2 in 81% yield. This compound was evaluated as the transition metal component of a tandem deoxgenative CO2 hydrosilation catalyst. At 5% loadings, complete consumption of Et3SiH was observed along with CO2 reduction products, but conversion to an inactive scandium complex identified as (B(2)Pz(4)Py)ScOSiEt3 was observed.
引用
收藏
页码:95 / 101
页数:7
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