Isolation, Characterization, and Reactivity of Fe8Me12(-): Kochi's S = 1/2 Species in Iron-Catalyzed Cross-Couplings with MeMgBr and Ferric Salts.

Isolation, Characterization, and Reactivity of Fe8Me12(-): Kochi's S = 1/2 Species in Iron-Catalyzed Cross-Couplings with MeMgBr and Ferric Salts.
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DOI:
10.1021/jacs.6b03760
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发表时间:
2016-06-22
影响因子:
15
通讯作者:
Neidig ML
Neidig ML
中科院分区:
化学1区
文献类型:
--
作者:
Muñoz Iii SB;Daifuku SL;Brennessel WW;Neidig ML

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自20世纪70年代以来,铁催化与简单铁盐的交叉偶联已经为人所知,Kochi率先使用包括MeMgBr在内的烷基镁亲核试剂进行交叉偶联。虽然Kochi观察到在简单铁盐与MeMgBr反应中形成S = 1/2的铁种,被认为是铁(I)种,但这种铁的身份近40年来一直没有确定。本文报道了[MgCl(THF)5][Fe8Me12]的分离和鉴定,结合EPR和MCD研究表明,[MgCl(THF)5][Fe8Me12]与Kochi的S = 1/2种一致。与β-溴苯乙烯的反应研究表明,该物种单独表现出最小的反应活性,但当与额外的MeMgBr结合时,会导致快速和选择性地形成交叉偶联产物。
Iron-catalyzed cross-couplings with simple ferric salts have been known since the 1970s, pioneered by Kochi for cross-coupling using alkylmagnesium nucleophiles including MeMgBr. While Kochi observed the formation of a S = 1/2 iron species in reactions of simple ferric salts with MeMgBr proposed to be an iron(I) species, the identity of this species has remained undefined for nearly 40 years. Herein, we report the isolation and characterization of [MgCl(THF)5][Fe8Me12], which combined with EPR and MCD studies is shown to be consistent with Kochi’s S = 1/2 species. Reaction studies with β-bromostyrene demonstrate that this species alone displays minimal reactivity but, when combined with additional MeMgBr, leads to rapid and selective formation of cross-coupled product.
DOI: 10.1021/jacs.5b06648
发表时间: 2015-09-09
影响因子: 15
作者:
Daifuku SL;Kneebone JL;Snyder BE;Neidig ML
通讯作者: Neidig ML
DOI: 10.1039/c39930001251
发表时间: 1993-08-21
影响因子: --
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期刊: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH
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