Fe and Co Complexes of Rigidly Planar Phosphino-Quinoline-Pyridine Ligands for Catalytic Hydrosilylation and Dehydrogenative Silylation
作者:Debashis Basu、Ryan Gilbert-Wilson、Danielle L. Gray、Thomas B. Rauchfuss、Aswini K. Dash
DOI:10.1021/acs.organomet.8b00416
日期:2018.8.27
of simple and complex 1-alkenes with a variety of hydrosilanes. Catalystsderivedfrom MesNQpy exhibited low activity. Fe-RPQpy derivedcatalysts favor hydrosilylation, whereas Co-RPQpy based catalysts favor dehydrogenative silylation. Catalystsderivedfrom CoX2(iPrPQpy) convert hydrosilanes and ethylene to vinylsilanes. Related experiments were conducted on propylene to give propenylsilanes.
Cationic Nickel(II)-Catalyzed Hydrosilylation of Alkenes: Role of P, N-Type Ligand Scaffold on Selectivity and Reactivity
作者:Istiak Hossain、Joseph A. R. Schmidt
DOI:10.1021/acs.organomet.0c00551
日期:2020.9.28
Seven structurally similar cationic nickel(II)–alkyl complexes were synthesized by using a series of P, N ligands, and their reactivity was explored in the hydrosilylation of alkenes. More electron-rich phosphines enhanced the overall reactivity of the transformation; in contrast, groups on the imine donor had little impact. Overall, these catalysts displayed reactivity and selectivity that was previously
dioxide (Co/TiO2) catalyst was synthesized by hydrogen treatment method. The Co/TiO2 catalyst acts as a highly efficient heterogeneous catalyst for the anti-Markovnikov hydrosilylation of alkenes under solvent-free conditions. Various alkenes were selectively converted to the corresponding alkylsilanes. This catalyst showed high stability in air and high reusability with maintained activity. The investigation
烯烃的氢化硅烷化对于有机硅化合物的合成很重要,为此,贵金属络合物已用作工业催化剂。考虑到环境和经济问题,强烈期望开发具有高稳定性,易分离性和高可重复使用性的富含地球的金属催化剂。在本文中,我们报道了通过氢处理方法合成了一种新型的钴离子掺杂的二氧化钛(Co / TiO 2)催化剂。Co / TiO 2催化剂在无溶剂条件下用作烯烃的反马尔可夫尼科夫氢化硅烷化反应的高效多相催化剂。将各种烯烃选择性地转化为相应的烷基硅烷。该催化剂在空气中显示出高稳定性,并在保持活性的情况下具有高可重复使用性。活性位点结构和Co的催化性能之间的关系的调查/的TiO 2公开了Co的高稳定性和耐用性/二氧化钛2都是起源选自Co和TiO之间的强相互作用2通过CoTiO形成3固溶体物种。
A Bottleable Imidazole-Based Radical as a Single Electron Transfer Reagent
作者:Arpan Das、Jasimuddin Ahmed、N. M. Rajendran、Debashis Adhikari、Swadhin K. Mandal
DOI:10.1021/acs.joc.0c02465
日期:2021.1.1
4-diphenyl-1H-imidazol-3-ium chloride (1) resulted in the formation of the first structurally characterized imidazole-based radical 2. 2 was established as a single electrontransferreagent by treating it with an acceptor molecule tetracyanoethylene. Moreover, radical 2 was utilized as an organic electron donor in a number of organic transformations such as in activation of an aryl–halide bond, alkene hydrosilylation
photocatalytic hydrosilylation of a variety of linear and cyclic alkenes has been investigated. It was found that the freeradical type photoinitiator Irgacure 2959 had a better effect on the hydrosilylation reaction; using 3 mol% photoinitiator Irgacure 2959, higher conversion rates can be obtained in the hydrosilylation of both some internal and terminal olefins. A new green method for hydrosilylation processes