for this process. Furthermore, α,β-unsaturated alcohols could be obtained from the selective reduction reactions of the corresponding α,β-unsaturatedcarbonyls catalyzed by hydrido iron(II) complex 5. This catalytic system has good tolerance for some common groups but it is easy to reduce the nitro group to an amino group. The experiments indicate that the chemoselectivity for this catalytic system is
三种新颖的硒代酚醛氢化铁(II)配合物[顺式-(H)(SeAr)Fe(PMe 3)4 ](4–6)(Ar = C 6 H 5(4),p -MeOC 6 H 4(5)和ö -MeC 6 ħ 4(6))至铁(PME的反应制备3)4与selenophenols ArSeH(1-3经由硒-H活化)。铁络合物氢基4,5和6可以催化醛和酮的氢化硅烷化。其中络合物5是该方法的最佳催化剂。此外,由氢化铁(II)配合物5催化的相应α,β-不饱和羰基的选择性还原反应可以得到α,β-不饱和醇。该催化体系对某些常见基团具有良好的耐受性,但易于将硝基还原为氨基。实验表明,该催化体系的化学选择性为CHO> NO 2 > C(O)CH 3。通过X射线衍射确定6的晶体结构。
now that the pseudocontact (dipolar) shifts can be accurately determined. The results show the power of integrated magnetic resonance (EPR and NMR) spectroscopy combined with theoretical calculations in understanding the subtleties of electronicstructure of the paramagnetic organometallic complex, in this case with S > 1/2, which could then be related to chemical reactivity or magnetic properties
基于与CrCl 2部分配位的喹啉取代的环戊二烯基环的一系列三个有机铬(III)配合物-C 5 Me 4(C 9 NH 6)CrCl 2(1),C 5 Ph 4(C 9 NH 6))CrCl 2(2)和C 5 Me 4(C 11 NH 10)CrCl 2(3)-已通过EPR光谱法进行了研究,包括高频和场EPR(HFEPR)以及11 H NMR。配合物3是新的,并且比1和2具有更高的溶解度,可以潜在地提高其作为烯烃聚合预催化剂的活性,该应用已针对1和2进行了文献报道。所述HFEPR研究表明,1 - 3表现出零场分裂(ZFS)即铬(III)(3D异常大3,小号= 3/2),如由轴向ZFS参数给定的d ≥〜3厘米-1。在这里确定的zfs为1与其他工人先前对该复合物的理论研究非常吻合,这些研究是在没有任何实验数据知识的情况下进行的。这种对理论和实验的“盲目”比较非常罕见。使用zfs数据对3的NMR光
Transition Metal Compound and Catalyst Composition Comprising Same
申请人:LG Chem, Ltd.
公开号:US20220024951A1
公开(公告)日:2022-01-27
A novel transition metal compound and a catalyst composition including same are disclosed herein. In some embodiments, the transition metal compound is represented by formula 1 disclosed herein. In some embodiments, the catalyst composition comprises the transition metal compound represented by formula 1. The catalyst composition may be useful for preparing an olefin-based polymer having a high molecular weight in a low density region, and may be useful for preparing an olefin-based polymer having a low melting index (MI) in high temperature conditions and a high molecular weight.