Regioselective addition of C(sp<sup>3</sup>)–H bonds of alkyl pyridines to olefins catalysed by cationic zirconium complexes
作者:Qiu Sun、Peipei Xie、Dan Yuan、Yuanzhi Xia、Yingming Yao
DOI:10.1039/c7cc03263c
日期:——
In situ generated cationic zirconium complexes stabilized by amine-bridged bis(phenolato) ligands have been developed to catalyse C(sp3)–H addition of alkyl pyridines to olefins, which are the firstexamples of group 4 metal based catalysts in this transformation. Ligand-controlled regioselectivity was observed, which was verified by DFT study.
Addition of C–H Bonds of Pyridine Derivatives to Alkenes Catalyzed by Zirconium Complexes Bearing Amine-Bridged Bis(phenolato) Ligands
作者:Qiu Sun、Ping Chen、Yaorong Wang、Yunjie Luo、Dan Yuan、Yingming Yao
DOI:10.1021/acs.inorgchem.8b01959
日期:2018.9.17
Cationic zirconium complexes in situ generated from zirconium dibenzyl complexes bearing amine-bridged bis(phenolato) ligands have been developed to catalyze addition of C(sp2)–H and C(sp3)–H bonds of pyridine derivatives to alkenes. A series of zirconium complexes bearing different ligands have been synthesized, and their activities in catalyzing addition of C(sp3)–H bonds of pyridine derivatives to alkenes
Bimetallic amine-bridged bis(phenolate) lanthanide aryloxides and alkoxides: synthesis, characterization, and application in the ring-opening polymerization of rac-lactide and rac-β-butyrolactone
of BBL. The influence imposed by lanthanides of different ionic radii and initiating groups of different structures on the activity, controllability, and stereoselectivity of polymerization were systematically studied and compared. Highly heterotactic PLA (P r up to 0.99) and syndiotactic PHB (P r ≈ 0.81) with high molecular weight and narrow polydispersity formed and were automatically capped with
一系列中性双金属镧系芳氧化物p -C 6 H 4 [OLnL(THF)n ] 2 [Ln = Y(1),Yb(2),Sm(3)(n = 1)和La(4)(n = 2),L = Me 2 NCH 2 CH 2 N CH 2-(2-OC 6 H 2 - t Bu 2 -3,5)} 2 ]和醇盐p -C 6 H 4 CH 2 [OLnL(THF) )] 2 通过Ln(C 5 H 5)3(THF),LH 2与p-的一锅反应合成了由胺桥联的双酚盐配体支撑的[Ln = Y(5),Yb(6)] 。苯二醇和1,4-苯二甲醇。所有络合物已被充分表征通过元素分析,单晶X射线衍射分析和IR和多核NMR光谱(在的情况下1,4和5)。对它们的催化行为的研究表明,通常,所有配合物都是外消旋丙交酯(LA)和外消旋-β-丁内酯(BBL),但BBL除外3和4。系统地研究和比较了不同离子半径的镧系元素和不同结构的引发基团对
Synthesis of Group 4 Metal Complexes Stabilized by an Amine-Bridged Bis(phenolato) Ligand and Their Catalytic Behavior in Intermolecular Hydroamination Reactions
bis(phenolato) ligand, have been synthesized and characterized. Although 1 and 2 were inactive in catalyzing intermolecularhydroamination reactions, cationic complexes generated in situ from treatment of 1 and 2 with borate [Ph3C][B(C6F5)4], respectively, were found to be highly active. In general, excellent yields (up to >99%) and 100% regioselectivity for a broad range of terminalalkynes and anilines
Pentacoordinate zirconium complexes 5 and 7 stabilized by amine-bridged bis(phenolato) ligands are more active than hexacoordinate complexes 1–4 in catalyzing intermolecular hydroamination reactions.