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Lithium, Magnesium, and Zinc Centers N,N′-Chelated by an Amine–Amide Hybrid Ligand
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-06-15 , DOI: 10.1021/acs.inorgchem.1c03850
Tomáš Chlupatý 1 , Zdeňka Růžičková 1 , Hana Kampová 1 , Jan Merna 2 , Aleš Růžička 1
Affiliation  

The synthesis and structure of lithium, magnesium, and zinc complexes N,N′-chelated by a hybrid amine–amido ligand ([2-(Me2NCH2)C6H4NR], abbreviated as LNR, where R = H, SiMe3, or Bn) are reported. The reaction of the least sterically demanding LNH with various magnesium sources gives the hexameric imide [LNMg]6 (4) by the elimination of n-butane from LNHMgnBu (2) or by the reaction of LNHLi (1) with MeMgBr. [LNH]2Mg (3) is obtained through the addition of 0.5 equiv of nBu2Mg or Mg[N(SiMe3)2]2 to LNH2 and with 1 equiv of nBu2Mg reacting to 2. Both LNHMgN(SiMe3)2 (6) and isostructural LNHZnN(SiMe3)2 (16) have been prepared using two different approaches: monodeprotonation of LNH2 by Zn/Mg[N(SiMe3)2]2 in a 1:1 ratio or ligand substitution of 2 or LNHZnEt (12) by 0.5 equiv of Sn[N(SiMe3)2]2. The reactions of 2 or 3 with 1 provide the heterotrimetallic complex [LNH]4Li2Mg (5). Benzyl- or trimethylsilyl-substituted anilines [LN(SiMe3)H (7) and LN(Bn)H (8)] with 0.5 equiv of nBu2Mg allow the formation of homoleptic bis(amides) of the [LN(R)]2Mg type (10 and 11). Nevertheless, only the silylated secondary amine 7 is able to provide the heteroleptic n-butylmagnesium amide LN(SiMe3)MgnBu (9) upon reaction with an equimolar amount of nBu2Mg. Similarly, 12, [LNH]2Zn (13), LN(R)ZnEt (17 and 18), and [LN(R)]2Zn [R = SiMe3 (19) and Bn (20)] were prepared by the monodeprotonation of LNH2 or LN(R)H using Et2Zn in the corresponding stoichiometric ratio. LNHZnI was prepared by the nucleophilic substitution of an ethyl chain in 12 by molecular iodine. A heterometallic complex, [LNH]4Li2Zn (14), analogous to 5 was prepared from 12 or 13 with 1 or 2 equiv of 1, respectively.

中文翻译:

由胺-酰胺杂化配体螯合的锂、镁和锌中心 N,N'-螯合

锂、镁和锌配合物N , N '-螯合胺-酰胺杂化配体 ([2-(Me 2 NCH 2 )C 6 H 4 NR] - , 缩写为 L N R ) 的合成及结构, 其中报道了 R = H、SiMe 3或 Bn)。空间要求最低的 L N H 与各种镁源的反应通过从 L N HMg n Bu ( 2 )中消除丁烷或通过 L N 的反应得到六聚酰亚胺 [L N Mg] 6 ( 4 )HLi ( 1 ) 与 MeMgBr。[L N H] 2 Mg ( 3 ) 通过将 0.5 equiv 的n Bu 2 Mg 或 Mg[N(SiMe 3 ) 2 ] 2添加到 L N H 2中并与 1 equiv 的n Bu 2 Mg 反应得到2 . L N HMgN(SiMe 3 ) 2 ( 6 ) 和同构的 L N HZnN(SiMe 3 ) 2 ( 16) 已使用两种不同的方法制备:通过 Zn/Mg[N(SiMe 3 ) 2 ] 2以 1:1 的比例单去质子化 L N H 2或2或 L N HZnEt ( 12 ) 的配体取代 0.5 equiv Sn[N(SiMe 3 ) 2 ] 2231的反应提供了异三金属配合物 [L N H] 4 Li 2 Mg ( 5 )。苄基或三甲基甲硅烷基取代的苯胺 [L N (SiMe 3)H ( 7 ) 和 L N (Bn)H ( 8 )] 与 0.5 当量的n Bu 2 Mg 允许形成 [L N (R)] 2 Mg 类型的均配双(酰胺) ( 1011 ) . 然而,只有甲硅烷基化仲胺7能够在与等摩尔量的n Bu 2 Mg反应时提供杂配丁基氨基镁L N (SiMe 3 )Mg n Bu ( 9 ) 。同样,12 , [L N H] 2Zn ( 13 )、L N (R)ZnEt ( 1718 ) 和 [L N (R)] 2 Zn [R = SiMe 3 ( 19 ) 和 Bn ( 20 )] 通过 L N H的单去质子化制备2或 L N (R)H 使用 Et 2 Zn 以相应的化学计量比。L N HZnI是通过分子碘对12中的乙基链进行亲核取代而制备的。一种异金属络合物,[L N H] 4 Li 2 Zn ( 14 ),类似于51213制备,分别具有 1 或 2 equiv 的1
更新日期:2022-06-15
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