Facile, Catalytic Dehydrocoupling of Phosphines Using β‐Diketiminate Iron(II) Complexes
作者:Andrew K. King、Antoine Buchard、Mary F. Mahon、Ruth L. Webster
DOI:10.1002/chem.201503399
日期:2015.11.2
Catalytic dehydrocoupling of primary and secondary phosphines has been achieved for the first time using an iron pre‐catalyst. The reaction proceeds under mild reaction conditions and is successful with a range of diarylphosphines. A proton acceptor is not needed for the transformation to take place, but addition of 1‐hexene does allow for turnover at 50 °C. The catalytic system developed also facilitates
Zinc Complexes with an Ethylene-Bridged Bis(β-diketiminate) Ligand: Syntheses, Structures, and Applications as Catalysts in the Borylation of Aryl Iodides
作者:Yafei Li、Yan Dang、Dawei Li、Huifen Pan、Liang Zhang、Li Wang、Zhu Cao、Yahong Li
DOI:10.1021/acs.organomet.0c00733
日期:2021.2.22
antiparallel mode. Thus, the molecular structures of 1 and 4·2THF exhibit a seesaw-like topology. The structures of 2·C6H14 and 3 are almost identical, in which two zinc atoms are shared by two ZnN2C3 six-membered rings, two Zn2ON2C2 seven-membered rings, and one Zn2O2 four-membered ring. Therefore, the metal cores of 2·C6H14 and 3 display a crownlike topology. All complexes are catalytically active for the
具有挠性桥的双核双(β-二酮)配体已被用于合成锌络合物。配体,缩写为H 2 L(H 2 L = N-(4-((2-((4-((2,6-二异丙基苯基)亚氨基)戊-2-烯-2-基)氨基)乙基)亚氨基)戊-2-烯-2-基)-2,6-二异丙基苯胺)用ZnEt 2去质子化,得到[LZn 2 Et 2 ](1)。1与2当量的BnOH和n BuOH的反应分别获得[LZn 2(OBn)2 ]·C 6 H 14(2 ·C 6 H 14)和[LZn 2(O n Bu)2 ](3)。用在THF中的2当量的I 2处理1产生[LZn 2 I 2(THF)2 ]·2THF(4 ·2THF)。X射线单晶衍射分析表明,它们都是杂多金属双金属化合物,两个金属中心被一组配体螯合。结构相似的化合物1和4· 2THF具有近似C 2对称性,其中两个β-二酮单元以头尾反平行模式排列。因此,1和4的分子结构·2THF表现出跷跷板状的拓扑结构。的结构2
Diverse Reactivity of a Rhenium(V) Oxo Imido Complex: [2 + 2] Cycloadditions, Chalcogen Metathesis, Oxygen Atom Transfer, and Protic and Hydridic 1,2-Additions
作者:Trevor D. Lohrey、Emmanuel A. Cortes、Jade I. Fostvedt、Alexander K. Oanta、Anukta Jain、Robert G. Bergman、John Arnold
DOI:10.1021/acs.inorgchem.0c01589
日期:2020.8.3
1 and CO or 2,6-xylylisocyanide (XylNC) was found to be much more facile, proceeding within seconds at room temperature. While the addition of excess CO led to a rhenium(III) imido dicarbonyl complex, we found that the addition of 2 equiv of XylNC was necessary to promote OAT, resulting in the isolation of a rare example of a stable metal isocyanate complex. Our experimental observations of CO and XylNC
Pd and Ni complexes of a novel vinylidene β-diketimine ligand: Their application as catalysts in Heck coupling and alkyne trimerization
作者:Raghavendra Beesam、Dastagiri Reddy Nareddula
DOI:10.1002/aoc.3696
日期:2017.9
A β‐diketimine ligand with vinylidene substitution at γ‐carbon, CH2C(CH3CNAr)2 (Ar = 2,6‐diisopropylphenyl) (L2), was synthesized by treating β‐diketimine H2C(CH3CNAr)2 with n‐BuLi followed by paraformaldehyde. L2 formed the homobimetallic ether‐bridged β‐diketiminatecomplex [O(CH2‐β‐diketiminate)Pd(OAc)}2] (1) with (PdOAc)2. It also gave complexes [L2PdCl2] (2) and [L2NiBr2] (3) when treated with
Rational Design of an Iron‐Based Catalyst for Suzuki–Miyaura Cross‐Couplings Involving Heteroaromatic Boronic Esters and Tertiary Alkyl Electrophiles
作者:Michael P. Crockett、Alexander S. Wong、Bo Li、Jeffery A. Byers
DOI:10.1002/anie.201914315
日期:2020.3.23
cross‐coupling reactions between a variety of alkyl halides and unactivated aryl boronicesters using a rationally designed iron‐based catalyst supported by β‐diketiminate ligands are described. High catalyst activity resulted in a broad substrate scope that included tertiary alkyl halides and heteroaromatic boronicesters. Mechanistic experiments revealed that the iron‐based catalyst benefited from the