Lithium Complexes of Neutral Bis-NHC Ligands

Brendel, Matthias; Wenz, Jan; Shishkov, Igor V.; Röminger, Frank; Hofmann, Peter

doi:10.1021/om501229b

Cited by 18 publications

(14 citation statements)

References 27 publications

(22 reference statements)

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“…The 13 C NMR shifts for the carbene atoms range between 206 and 212 ppm depending on the counterion; 211.9, 211.1 ppm (bromide ion), and 205.9 ppm (PF 6 À ion). 18 These values support an incremental influence on the chemical shift of each coordinated carbene moiety. The chemical shifts of compounds 6a-e and h,i are in accordance with these reported values for bis(NHC) ligands.…”

Section: Synthesis and Characterization Of Li(bimca R ) Complexesmentioning

confidence: 84%

Optimised synthesis of monoanionic bis(NHC)-pincer ligand precursors and their Li-complexes

et al. 2016

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Section: Synthesis and Characterization Of Li(bimca R ) Complexesmentioning

confidence: 84%

Optimised synthesis of monoanionic bis(NHC)-pincer ligand precursors and their Li-complexes

et al. 2016

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“…Similar structures are observed for different anions (PF 6 instead of Br) and different wingtip substituents (Dipp instead of t Bu). Prolonged crystallization time of the Dipp-substituted bis(NHC) lithium adduct led to the polymeric complex 16 . The complexes have been used to synthesize Ni(0) and Pt(0) complexes with chelating bis(NHC) ligands …”

Section: Nhc Complexes Of Main Group Elementsmentioning

confidence: 99%

“…89 Lithium complexes 14−16 with a chelating neutral bis-(NHC) ligand have been reported by Hofmann et al (Figure 6). 90 They were synthesized by addition of LiHMDS to the corresponding methylene bridged bis(imidazolium) salt, and all structures were determined by single-crystal XRD: complex 14 shows a dimeric structure with two bridging bromide ligands between two lithium centers, each coordinated by two NHC moieties from the same chelating ligand with Li−C distances of 2.212 (8) and 2.255(8) Å. The monomeric complex (15a) can be obtained when the crystallization is carried out at low temperature.…”

Section: Nhc Complexes Of Group 1 Metalsmentioning

confidence: 99%

NHCs in Main Group Chemistry

et al. 2018

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Since the discovery of the first stable N-heterocyclic carbene (NHC) in the beginning of the 1990s, these divalent carbon species have become a common and available class of compounds, which have found numerous applications in academic and industrial research. Their important role as two-electron donor ligands, especially in transition metal chemistry and catalysis, is difficult to overestimate. In the past decade, there has been tremendous research attention given to the chemistry of low-coordinate main group element compounds. Significant progress has been achieved in stabilization and isolation of such species as Lewis acid/base adducts with highly tunable NHC ligands. This has allowed investigation of numerous novel types of compounds with unique electronic structures and opened new opportunities in the rational design of novel organic catalysts and materials. This Review gives a general overview of this research, basic synthetic approaches, key features of NHC-main group element adducts, and might be useful for the broad research community.

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“…Though group 1 metal complexes bound to NHCs with anionic tethers have been reported, examples of neutral NHC group 1 metal complexes are extremely limited. 12,26 Furthermore, the only homoleptic complexes are those reported by Hill and co-workers, [(IPr) 2 M][AeN″ 3 ] (IPr = C(NDippCH) 2 , M = Li, Na, K). 27 Complex 6 was structurally characterised in a single crystal X-ray diffraction study (Fig.…”

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confidence: 99%