研究了在烷基铝助催化剂存在下,镍(II)噻吩并肟肟配合物(3)对乙烯的低聚反应性。发现该配合物是在助催化剂例如甲基铝氧烷(MAO)和氯化二乙基铝(DEAC)存在下的选择性乙烯二聚催化剂。使用DEAC,其生产率大大高于使用MAO的生产率。在最佳条件下,使用DEAC的生产率达到388 kg / mol催化剂/ h / bar,而对于MAO,该值为119 kg / mol催化剂/ h / bar。配合物3显示出高达90%的良好乙烯转化率,并且对C 4中的1-丁烯具有极高的α-选择性(> 99.5%)。产品。还进行了使用密度泛函理论(DFT)的计算研究,以确定吡啶酮肟肟配体2的3以及Ni(II)配合物的分解途径。结果表明,通过与DEAC的反应,连接到金属中心的两个双齿肟配体之一可能会丢失2和3。另外,计算表明,随后的分解步骤是显著为更可能3比2从而解释了为什么吡啶酮肟配体结合的镍络合物2实验发现为
Screening of ligands for the Ullmann synthesis of electron-rich diaryl ethers
作者:Nicola Otto、Till Opatz
DOI:10.3762/bjoc.8.122
日期:——
In the search for new ligands for the Ullmanndiaryl ether synthesis, permitting the coupling of electron-rich aryl bromides at relatively low temperatures, 56 structurally diverse multidentate ligands were screened in a model system that uses copper iodide in acetonitrile with potassium phosphate as the base. The ligands differed largely in their performance, but no privileged structural class could
Chirality Transfer in Rhodium(I)-Catalyzed [3 + 2]-Cycloaddition of Vinyl Aziridines and Oxime Ethers: Atom-Economical Synthesis of Chiral Imidazolidines
A highly efficient and stereoselective synthesis of enantioenriched imidazolidines by rhodium-catalyzed intermolecular [3 + 2] cycloaddition reaction of chiral vinyl aziridines and oxime ethers has been successfully developed. Notably, both aldoximes and ketoximes are suitable substrates to afford the corresponding chiral imidazolidines in high yields with good stereoselectivity. This transformation
Synthesis of 2-aryl quinazolines from (2-aminophenyl)methanol and oxime ether catalyzed by copper ferrite nanoparticles
作者:Sachin A. Sarode、Vilas G. Jadhav、Jayashree M. Nagarkar
DOI:10.1016/j.tetlet.2017.01.037
日期:2017.2
Magnetically separable copper ferrite nps as a catalytic system, under solvent free reaction condition for synthesis of 2-arylquinazolines has been reported. (2-aminoaryl)methanols and various types of oximeethers were efficiently converted into desired products in moderate to good yields. This protocol offers a greener and atom efficient process, using recyclable heterogeneous catalytic system.
The first general method of direct and highly stereoselective Ti-mediated Mannich reaction between three types of simpleesters and E and Z mixtures of oxime ethers (aliphatic and aromatic) is accomplished.
A catalytic and DFT study of selective ethylene oligomerization by nickel(II) oxime-based complexes
作者:Kamlesh N. Tayade、Manoj V. Mane、Suman Sen、C.N. Murthy、Gopal L. Tembe、S. Muthukumaru Pillai、Kumar Vanka、Soumen Mukherjee
DOI:10.1016/j.molcata.2012.09.029
日期:2013.1
explaining why the pyridine ketoxime ligand bound nickelcomplex 2 was experimentally found to be more stable than the thiophene aldoxime bound nickelcomplex 3. Calculations also show that the proton of the -OH group (oxime) plays a major role in the stability of the molecules. This was confirmed experimentally by synthesizing the Ni(II) dichloro complex of Pyridine-2-carbaldehyde O-methyloxime 5 and
研究了在烷基铝助催化剂存在下,镍(II)噻吩并肟肟配合物(3)对乙烯的低聚反应性。发现该配合物是在助催化剂例如甲基铝氧烷(MAO)和氯化二乙基铝(DEAC)存在下的选择性乙烯二聚催化剂。使用DEAC,其生产率大大高于使用MAO的生产率。在最佳条件下,使用DEAC的生产率达到388 kg / mol催化剂/ h / bar,而对于MAO,该值为119 kg / mol催化剂/ h / bar。配合物3显示出高达90%的良好乙烯转化率,并且对C 4中的1-丁烯具有极高的α-选择性(> 99.5%)。产品。还进行了使用密度泛函理论(DFT)的计算研究,以确定吡啶酮肟肟配体2的3以及Ni(II)配合物的分解途径。结果表明,通过与DEAC的反应,连接到金属中心的两个双齿肟配体之一可能会丢失2和3。另外,计算表明,随后的分解步骤是显著为更可能3比2从而解释了为什么吡啶酮肟配体结合的镍络合物2实验发现为