Journal ArticleDOI
Organocalcium-mediated nucleophilic alkylation of benzene
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TLDR
Several organocalcium compounds prepared can alkylate benzene by displacing a hydride, with no need for a more conventionally reactive leaving group such as chloride (see the Perspective by Mulvey).Abstract:
The electrophilic aromatic substitution of a C–H bond of benzene is one of the archetypal transformations of organic chemistry. In contrast, the electron-rich π-system of benzene is highly resistant to reactions with electron-rich and negatively charged organic nucleophiles. Here, we report that this previously insurmountable electronic repulsion may be overcome through the use of sufficiently potent organocalcium nucleophiles. Calcium n -alkyl derivatives—synthesized by reaction of ethene, but-1-ene, and hex-1-ene with a dimeric calcium hydride—react with protio and deutero benzene at 60°C through nucleophilic substitution of an aromatic C–D/H bond. These reactions produce the n- alkyl benzenes with regeneration of the calcium hydride. Density functional theory calculations implicate an unstabilized Meisenheimer complex in the C–H activation transition state.read more
Citations
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The Road Travelled: After Main‐Group Elements as Transition Metals
TL;DR: In this article, an overview of the last 10 years since Power's seminal review, and the progress made for catalytic application is presented, where the use of low oxidation state and/or low coordinate group 13 and 14 complexes towards small molecule activation (oxidative addition step in a redox based cycle) is examined.
Journal ArticleDOI
Observation of alkaline earth complexes M(CO)8 (M = Ca, Sr, or Ba) that mimic transition metals
Xuan Wu,Lili Zhao,Jiaye Jin,Sudip Pan,Wei Li,Xiaoyang Jin,Guanjun Wang,Mingfei Zhou,Gernot Frenking,Gernot Frenking +9 more
TL;DR: Analysis of the electronic structure of these cubic Oh-symmetric complexes reveals that the metal–carbon monoxide (CO) bonds arise mainly from [M(dπ)] → (CO]8 π backdonation, which explains the strong observed red shift of the C-O stretching frequencies.
Journal ArticleDOI
Molecular Main Group Metal Hydrides
Matthew M. D. Roy,Alvaro A. Omaña,Andrew S. S. Wilson,Michael S. Hill,Simon Aldridge,Eric Rivard +5 more
TL;DR: In this article, a review serves to document advances in the synthesis, versatile bonding, and reactivity of molecular main group metal hydrides within groups 1, 2, and 12-16.
Journal ArticleDOI
Boosting Low-Valent Aluminum(I) Reactivity with a Potassium Reagent.
TL;DR: DFT calculations confirm that the Al center in 1 is more reactive than that in (DIPPBDI)Al, and Calculations show that both AlI and K+ work in concert and determines the reactivity of 1.
Journal ArticleDOI
Nucleophilic Aromatic Substitution at Benzene with Powerful Strontium Hydride and Alkyl Complexes
Bastian Rösch,Thomas Xaver Gentner,Holger Elsen,Christian Fischer,Jens Langer,Michael Wiesinger,Sjoerd Harder +6 more
TL;DR: The high reactivity of this alkyl strontium complex is demonstrated by facile ethylene polymerization and nucleophilic aromatic substitution with C6 D6, giving alkylated aromatic products and [(DIPeP BDI)SrD]2 .
References
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