Bis-aryloxo-functionalized NHC complexes of ytterbium(III): Syntheses and structures of Yb[O-4,6-tBu2-C6H2-2-CH2{C(RNCHCHN)}]2N(iPr)2 (R=iPr, Me)

Wang, Zhiguo; Sun, Hongjian; Yao, Huiqiang; Yao, Yingming; Shen, Qi; Zhang, Yong

doi:10.1016/j.jorganchem.2006.04.029

Cited by 49 publications

(17 citation statements)

References 31 publications

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“…enhance the bond of NHC to these electropositive metals (Arnold et al,2006;Liddle et al, 2007). A series of anionic functionalized NHCs have been synthesized and structurally characterized (Arnold et al, 2009;Wang et al, 2006a ).…”

Section: Methodsmentioning

confidence: 99%

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Bis[1-(3,5-di-tert-butyl-2-hydroxybenzyl)-3-isopropylimidazolium] pentachlorido(tetrahydrofuran)samarate(III)–tetrahydrofuran–toluene (1/1/1)

2010

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The title compound, (C21H33N2O)2[SmCl5(C4H8O)]·C7H8·C4H8O, has a layered structure in which each distorted octahedral [SmCl5(THF)]2− unit (THF is tetrahydrofuran) is capped by two cations. The central metal SmIII atom of the [SmCl5(THF)]2− anionic unit is coordinated by five Cl atoms and one THF O atom, forming a distorted octahedral geometry. The crystal structure displays C—H⋯Cl and O—H⋯Cl hydrogen bonding. The structure exhibits disorder of the solvent.

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Section: Methodsmentioning

confidence: 99%

“…However, the reaction of ligands with cerium triiodide (Arnold et al,2005) or ytterbium trichloride (Wang et al, 2006a) in the presence of organic base gives no desired product. Especially noteworthy is the cleavage reaction of the ligand that occurs during the reaction process ( Wang et al, 2006b ).…”

Section: Methodsmentioning

confidence: 99%

Bis[1-(3,5-di-tert-butyl-2-hydroxybenzyl)-3-isopropylimidazolium] pentachlorido(tetrahydrofuran)samarate(III)–tetrahydrofuran–toluene (1/1/1)

2010

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“…A series of CCC-pincer 2,6-xylenyl bis(carbene)-ligated Ln dibromides (60)(61)(62)(63)(64)(65)(66)(67)(68)(69) were synthesized via the treatment of imidazolium dibromide proligands and LnCl 3 with dropwise addition of n BuLi (Figure 15) [79,80]. The Y, Nd, Gd, Dy, and Ho complexes exhibited high activity and cis-1,4 selectivity (99.6%, 25 • C) in the polymerization of isoprene under activation with AlR 3 (R = Me, Et, i Bu) and [Ph 3 C][B(C 6 F 5 ) 4 ], while the others were inactive.…”

Section: Rare Earth Catalysts Containing a Tridentate Nhc Ligandmentioning

confidence: 99%

Recent Advances in Rare Earth Complexes Containing N-Heterocyclic Carbenes: Synthesis, Reactivity, and Applications in Polymerization

Pan

Jiang

et al. 2020

Catalysts

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N-heterocyclic carbenes (NHCs) are ubiquitous ancillary ligands employed in metal-catalyzed homogeneous reactions and polymerization reactions. Of significance is the use of NHCs as the supporting ligand in second- and third-generation Grubbs catalysts for their application in olefin metathesis and ring-opening metathesis polymerization. While the applications of transition metal catalysts ligated with NHCs in polymerization chemistry are well-documented, the use of analogous rare earth (Ln = Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) catalysts in this area remains under-developed, despite the unique role of rare earth elements in regio- and stereo-specific (co)polymerization reactions. By using hetero-atom-tethered chelating NHCs and, more recently, the employment of other structurally related NHCs, NHC-ligated Ln complexes have proven to be promising and fruitful catalysts for selective polymerization reactions. This review summarizes the recent developments in the coordination chemistry of Ln complexes containing NHCs and their catalytic performance in polymerization.

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“…The nature of the anionic tether greatly influences the properties and reactivity of the resulting complexes. Consequently, numerous anionic groups, possessing a wide range of basicity, have already been reported in the literature: alkoxide, − aryloxide, − bis-aryloxide, , enolate, amino, − bis-amido, − bis-thiolate, indenyl, and fluorenyl. , These have been subject of numerous reviews. , …”

Section: Introductionmentioning

confidence: 99%

From Chelating to Bridging Ligands:N-Sulfonyliminoimidazolium Ylides as Precursors to AnionicN-Heterocyclic Carbene Ligands

et al. 2018

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The synthesis and investigation of a new family of anionic N-heterocyclic carbene (NHC) ligands, based on Nsulfonyliminoimidazolium ylides, is reported. Their corresponding silver complexes have been synthesized and present distinctive geometries compared to the previously reported ligands derived from the N-acyliminoimidazolium family. A comparison of the two ligand families was performed with palladium(II) allyl complexes to investigate their binding mode preference. The N-sulfonyl derived ligands were found to strongly favor bridging binding instead of chelation. This strong preference was exploited to synthesize a novel copper(I)−palladium(II) heterotrimetallic complex.

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Bis-aryloxo-functionalized NHC complexes of ytterbium(III): Syntheses and structures of Yb[O-4,6-tBu2-C6H2-2-CH2{C(RNCHCHN)}]2N(iPr)2 (R=iPr, Me)

Cited by 49 publications

References 31 publications

Bis[1-(3,5-di-tert-butyl-2-hydroxybenzyl)-3-isopropylimidazolium] pentachlorido(tetrahydrofuran)samarate(III)–tetrahydrofuran–toluene (1/1/1)

Bis[1-(3,5-di-tert-butyl-2-hydroxybenzyl)-3-isopropylimidazolium] pentachlorido(tetrahydrofuran)samarate(III)–tetrahydrofuran–toluene (1/1/1)

Recent Advances in Rare Earth Complexes Containing N-Heterocyclic Carbenes: Synthesis, Reactivity, and Applications in Polymerization

From Chelating to Bridging Ligands:N-Sulfonyliminoimidazolium Ylides as Precursors to AnionicN-Heterocyclic Carbene Ligands

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