Promising new catalytic properties of a Co (II)‐carboxamide complex and its derived Co
<sub>3</sub>
O
<sub>4</sub>
nanoparticles for the Mizoroki‐Heck and the Epoxidation reactions
The new Co(II) ‐ carboxamide complex (1) and Co3O4 nanoparticles (2), by way of thermal decomposition of (1) have been efficiently synthesised in the environment‐friendly. X‐ray diffraction reveals a slightly distorted octahedral coordination of cobalt (four nitrogens and two oxygens) in (1) and regular octahedral or tetrahedral ones (oxygens only) in (2). The investigation of (1) and (2) in the Mizoroki‐Heck
新的Co(II)-羧酰胺配合物(1)和Co 3 O 4纳米颗粒(2)通过热分解(1)已在环境友好的条件下有效合成。X射线衍射显示稍微扭曲的八面体的钴(四个氮和两个氧)在(协调1)四面体酮(仅氧)在(和规则的八面体或2)。对(1)和(2)在Mizoroki-Heck中的研究和链烷烃反应的环氧化表明,它们都是功能强大,绿色且价格便宜的催化剂。
Catalytic, asymmetric difluorination of alkenes to generate difluoromethylated stereocenters
作者:Steven M. Banik、Jonathan William Medley、Eric N. Jacobsen
DOI:10.1126/science.aaf8078
日期:2016.7
difluoromethylated tertiary or quaternary stereocenters. The reaction uses commercially available reagents (m-chloroperbenzoic acid and hydrogen fluoride pyridine) and a simple chiral aryl iodide catalyst and is carried out readily on a gram scale. Substituent effects and temperature-dependent variations in enantioselectivity suggest that cation-π interactions play an important role in stereodifferentiation
Dombrovskii,A.V. et al., Journal of general chemistry of the USSR, 1962, vol. 32, p. 592 - 596
作者:Dombrovskii,A.V. et al.
DOI:——
日期:——
Selective arylation of 1,1-disubstituted olefins using a biphenyl-based phosphine in Heck coupling reactions
作者:Shirin Nadri、Mohammad Joshaghani、Ezzat Rafiee
DOI:10.1016/j.tetlet.2009.07.052
日期:2009.9
The biphenyl-based phosphine, 2-diphenylphosphino-2'-methylbiphenyl is an effective ligand for palladium-catalyzed terminal arylation of 1,1-disubstituted olefins with aryl bromides in DMF and K2CO3 as base. The yields of products are independent of the electronic properties of the aryl bromides, however, the nature of the olefin has a major effect. (C) 2009 Elsevier Ltd. All rights reserved.