Synthesis and Reactivity of N-heterocyclic Carbene Stabilized Lanthanide(II) Bis(amido) Complexes
作者:Zexiong Pan、Dongjing Gao、Chunqi Zhang、Lulu Guo、Jianfeng Li、Chunming Cui
DOI:10.1021/acs.organomet.1c00207
日期:2021.6.14
bis(amido) adducts 3,4Sm and 2–4,7,8Eu. σ-bond metathesis reactions of (IiPr)2Yb[N(SiMe3)2]2 (2Yb; IiPr = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) with alkyne, aniline, and phenol yielded alkynyl-bridged [(IiPr)Yb[N(SiMe3)2](μ-C≡CtBu)]2 (9), monomeric (IiPr)2Yb[N(SiMe3)2](NHAr1) (10; Ar1 = 2,6-iPr2C6H3), and (IiPr)2Yb(OAr2)2 (11; Ar2 = 2,6-tBu2-4-MeC6H2), respectively. All of the NHC adducts of lanthanide(II)
由于其高稳定性,镧系元素酰胺是镧系元素有机金属化学中一些最重要的试剂和催化剂。然而,现成的均质Ln[N(SiMe 3 ) 2 ] n ( n = 2, 3) 配合物缺乏调节其反应性和选择性的可行策略。在本文中,单齿 N-杂环卡宾 (NHC) 用于合成二价镧系元素双(酰胺)加合物3 , 4Sm和2 – 4 , 7 , 8Eu。(I i Pr) 2 Yb[N(SiMe 3 ) 的σ键复分解反应2 ] 2 ( 2Yb ; I i Pr = 1,3-二异丙基-4,5-二甲基咪唑-2-亚基) 与炔、苯胺和苯酚产生炔基桥连 [(I i Pr)Yb[N(SiMe 3 ) 2 ](μ-C≡C t Bu)] 2 ( 9 ), 单体 (I i Pr) 2 Yb[N(SiMe 3 ) 2 ](NHAr 1 ) ( 10 ; Ar 1 = 2,6- i Pr 2 C 6 H 3 ) 和 (I i Pr) 2 Yb(OAr