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| 1 | Synthesis,Characterization of Rare-Earth Metal Chlorides Bearing Indolyl-Based NCN Pincer Ligand and Their Catalytic Activity toward 1,4-cis Polymerization of Isoprene显示文摘A novel indolyl-based NCN pincer ligand precursor HL(HL=(1-(2-(CH_(2))_(4)NCH_(2)CH_(2))-3-(2,6-ipr_(2)C_(6)H_(3)N=CH)C_(8)H_(5)N))was rationally and precisely designed,and successfully prepared in a high yield.Lithiation of HL with ^(n)BuLi in n-hexane,followed by treatment with RECl_(3) in THF led to the isolation of rare-earth metal chlorides in monomeric form(κ^(3)-L)RECI_(2)(THF)(RE=Sc(2),Yb(3)),and dimeric form[(κ^(3)-L)RECI(THF)(μ-Cl)]_(2)(RE=Er(4),Y(5))bearing the novel indolyl-based NCN pincer ligand in designed pincer ligation depending on different metal ionic radii;and the chloride bridged rare-earth metal and lithium mixed complexes in form(κ^(2)-L)_(2)RE(μ-Cl)_(2)Li(THF)_(2)(RE=Y(6),Dy(7)).All complexes were fully characterized and their structures were determined.The diamagnetic complexes 2,5 and 6 were furtherly characterized by the NMR spectroscopic method.The catalytic activity studies revealed that the central metal ions,borates,aluminum alkyls,and ligation of the central metal ions have influences on catalytic activity,and regio-and stereoselectivity for the polymerization of isoprene.With cooperation of the cocatalysts,the pincer-type yttrium chloride 5 initiated the isoprene polymerization with a high activity producing polymers with high regio-and stereoselectivity(1,4-cis polymers up to 99.6%),and the Mn as high as 8.76×10^(5). | Zeming Huang Shaowu Wang Xiancui Zhu Yun Wei Qingbing Yuan Shuangliu Zhou Xiaolong Mu Hua Wang | 2021 | Chinese Journal of Chemistry2021，39，12： | 2 |
| 2 | Iron Catalyzed Isomerization of a-Alkyl Styrenes to Access Trisubstituted Alkenes显示文摘Main observation and conclusion Stereoselective isomerization of a-alkyl styrenes is accomplished using a new iron catalyst supported by phosphine-pyridine-oxazoline(PPO)ligand.The protocol provides an atom-efficient and operationally simple approach to trisubstituted alkenes in high yields with excellent regio-and stereoselectivities under mild conditions.The results of deuterium-labelling and radical trap experiments are consistent with an iron-hydride pathway involving reversible alkene insertion andβ-H elimination. | Songgen Xu Guixia Liu Zheng Huang | 2021 | Chinese Journal of Chemistry2021，39，3： | 1 |
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