2.3-Dihydro-2-Methoxyethylimino-L,3-Dimethylimidazol - Ein Neuer Hemilabil Koordinierender Chelatligand [1]

Kühn, Norbert; Grathwohl, Martin; Nachtigal, C.; Steimann, Manfred

doi:10.1515/znb-2001-0802

Cited by 14 publications

(3 citation statements)

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“…The reaction with [Rh(COD)Cl] 2 or [(PhCN) 2 PdCl 2 ] gave the rhodium(I) and palladium(II) complexes 277 and 278 , respectively. Treatment of 277 with AgBF 4 furnished a cationic complex, in which [(IMe)N(C 2 H 4 OCH 3 )] acts as a chelating N,O-donor ligand …”

Section: N-heterocyclic Carbene Adducts Of Group 15 Elementsmentioning

confidence: 99%

“…While these systems are interesting ligands in their own right and serve as monodentate or bidentate N,O-donor ligands, 408 their reaction with [Ni(COD) 2 ] proceeded with oxidative addition and N−N bond cleavage to form the bimetallic nitrosyl complexes 273, in which the imidazolin-2iminato ligands bind in a bridging fashion (Scheme 76). 409 In contrast, the reaction of (IMes)N 2 O with the early transition metal vanadium(III) complex [V(Mes) 3 (THF)] led to 412 The groups of Alcarazo 413 and Cronje 414 independently reported modified benzannulated imidazolin-2-imine ligands 279a and 279b (Scheme 77). The former ligand was isolated by treatment of 2-chloro-1,3-dimethylbenzimidazolium tetrafluoroborate with 2,4,6-trimethylaniline (MesNH 2 ), followed by reaction with potassium hydride, while the latter was prepared from 2-amino-benzimidazole by 2-fold methylation and deprotonation with KH, similar to Kuhn's route.…”

Section: Leadmentioning

confidence: 99%

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N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry

2019

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N-Heterocyclic carbenes (NHC) are nowadays ubiquitous and indispensable in many research fields, and it is not possible to imagine modern transition metal and main group element chemistry without the plethora of available NHCs with tailor-made electronic and steric properties. While their suitability to act as strong ligands toward transition metals has led to numerous applications of NHC complexes in homogeneous catalysis, their strong σ-donating and adaptable π-accepting abilities have also contributed to an impressive vitalization of main group chemistry with the isolation and characterization of NHC adducts of almost any element. Formally, NHC coordination to Lewis acids affords a transfer of nucleophilicity from the carbene carbon atom to the attached exocyclic moiety, and low-valent and lowcoordinate adducts of the p-block elements with available lone pairs and/or polarized carbon-element π-bonds are able to act themselves as Lewis basic donor ligands toward transition metals. Accordingly, the availability of a large number of novel NHC adducts has not only produced new varieties of already existing ligand classes but has also allowed establishment of numerous complexes with unusual and often unprecedented element−metal bonds. This review aims at summarizing this development comprehensively and covers the usage of N-heterocyclic carbene adducts of the p-block elements as ligands in transition metal chemistry.

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Section: N-heterocyclic Carbene Adducts Of Group 15 Elementsmentioning

confidence: 99%

Section: Leadmentioning

confidence: 99%

N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry

2019

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“…Their donor properties have often been compared to those of NHCs, and a flexible electronic nature has been demonstrated for some of these scaffolds (Scheme ). NHI ligands are known to coordinate to a variety of transition metals, including Pd(II), Rh(I), and Cu(II) as well as main-group metals . Moreover, NHIs have seen application in CO 2 utilization , and lactide polymerization .…”

Section: Introductionmentioning

confidence: 99%

Pyridylidene Amines and Amides: Donor-Flexible Ligands for Catalysis

Race

Albrecht

2023

ACS Catal.

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Ligands with flexible donor properties exhibit the unique ability to transition within the continuum of neutral (L-type) and anionic (X-type) metal bonding in response to their local electronic environment. This flexibility stabilizes transition-metal complexes in unparalleled ways and facilitates catalytic turnovers, especially when the catalytic cycle features the active metal center in different oxidation states. Pyridylidene amines (PYEs) and pyridylidene amides (PYAs) are examples of nitrogenbased donor-flexible ligands. In the past decade, the application of PYE and PYA ligands in transition-metal catalysis has been growing, to now include reactions such as hydrogen transfer reactions, water oxidation, and CO 2 utilization, among many others. Here we provide an overview of these powerful ligands, including their synthesis, their donor properties, and in particular their catalytic application�highlighting the key ligand features that impart high activity, as well as the wide potential of this rather underexplored ligand system for diverse catalytic applications.

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Rare Earth and Alkaline Earth Metal Complexes with Me₂Si‐Bridged Cyclopentadienyl‐Imidazolin‐2‐Imine Ligands and Their Use as Constrained‐Geometry Hydroamination Catalysts

et al. 2008

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2.3-Dihydro-2-Methoxyethylimino-L,3-Dimethylimidazol - Ein Neuer Hemilabil Koordinierender Chelatligand [1]

Cited by 14 publications

References 2 publications

N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry

N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry

Pyridylidene Amines and Amides: Donor-Flexible Ligands for Catalysis

Rare Earth and Alkaline Earth Metal Complexes with Me₂Si‐Bridged Cyclopentadienyl‐Imidazolin‐2‐Imine Ligands and Their Use as Constrained‐Geometry Hydroamination Catalysts

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2.3-Dihydro-2-Methoxyethylimino-L,3-Dimethylimidazol - Ein Neuer Hemilabil Koordinierender Chelatligand [1]

Cited by 14 publications

References 2 publications

N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry

N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry

Pyridylidene Amines and Amides: Donor-Flexible Ligands for Catalysis

Rare Earth and Alkaline Earth Metal Complexes with Me2Si‐Bridged Cyclopentadienyl‐Imidazolin‐2‐Imine Ligands and Their Use as Constrained‐Geometry Hydroamination Catalysts

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Rare Earth and Alkaline Earth Metal Complexes with Me₂Si‐Bridged Cyclopentadienyl‐Imidazolin‐2‐Imine Ligands and Their Use as Constrained‐Geometry Hydroamination Catalysts