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Group 6 Metal NHC and CAAC Complexes in Homogeneous Catalysis: Reactivity Trends and Selected Applications.

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Title: Group 6 Metal NHC and CAAC Complexes in Homogeneous Catalysis: Reactivity Trends and Selected Applications.
Authors: Garcia, Beatriz1 (AUTHOR), Bertoldo, Alberto1 (AUTHOR), Royo, Beatriz1 (AUTHOR) broyo@itqb.unl.pt
Source: ChemCatChem. May2026, Vol. 18 Issue 9, p1-24. 24p.
Subjects: Homogeneous catalysis, Ligands (Chemistry), Reaction mechanisms (Chemistry), Transition metal catalysts, Catalytic activity, Metal complexes, Catalyst structure
Abstract: Complexes of chromium, molybdenum, and tungsten bearing N‐heterocyclic carbene (NHC) ligands have emerged as versatile platforms for homogeneous catalysis, combining the strong σ‐donor properties and structural tunability of NHCs with the availability and rich redox chemistry of these metals. Over the past decade, NHC ligation has enabled access to well‐defined Group 6 complexes spanning a wide range of oxidation states and coordination environments, including low‐valent carbonyl species, chelating bis‐NHC frameworks, and high‐valent oxo and nitride derivatives. These systems have been explored in a variety of catalytic transformations, for example, reduction, dehydrogenation, and oxidation. This review provides an overview of the development of Group 6 metal‐NHC complexes in homogeneous catalysis, focusing on the relationship between catalyst structure, ligand design, and reactivity. Emphasis is placed on mechanistic insights that illustrate how NHC ligands influence catalyst stability, activation pathways, and selectivity across different reaction classes. Rather than providing exhaustive coverage, the discussion highlights representative examples that define current capabilities and limitations, and identifies design principles and challenges that are likely to shape future advances. [ABSTRACT FROM AUTHOR]
Copyright of ChemCatChem is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 193814719
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  Data: Group 6 Metal NHC and CAAC Complexes in Homogeneous Catalysis: Reactivity Trends and Selected Applications.
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  Data: <searchLink fieldCode="AR" term="%22Garcia%2C+Beatriz%22">Garcia, Beatriz</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bertoldo%2C+Alberto%22">Bertoldo, Alberto</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Royo%2C+Beatriz%22">Royo, Beatriz</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> broyo@itqb.unl.pt</i>
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  Data: <searchLink fieldCode="JN" term="%22ChemCatChem%22">ChemCatChem</searchLink>. May2026, Vol. 18 Issue 9, p1-24. 24p.
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  Data: <searchLink fieldCode="DE" term="%22Homogeneous+catalysis%22">Homogeneous catalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Ligands+%28Chemistry%29%22">Ligands (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Reaction+mechanisms+%28Chemistry%29%22">Reaction mechanisms (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+metal+catalysts%22">Transition metal catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Catalytic+activity%22">Catalytic activity</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+complexes%22">Metal complexes</searchLink><br /><searchLink fieldCode="DE" term="%22Catalyst+structure%22">Catalyst structure</searchLink>
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  Label: Abstract
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  Data: Complexes of chromium, molybdenum, and tungsten bearing N‐heterocyclic carbene (NHC) ligands have emerged as versatile platforms for homogeneous catalysis, combining the strong σ‐donor properties and structural tunability of NHCs with the availability and rich redox chemistry of these metals. Over the past decade, NHC ligation has enabled access to well‐defined Group 6 complexes spanning a wide range of oxidation states and coordination environments, including low‐valent carbonyl species, chelating bis‐NHC frameworks, and high‐valent oxo and nitride derivatives. These systems have been explored in a variety of catalytic transformations, for example, reduction, dehydrogenation, and oxidation. This review provides an overview of the development of Group 6 metal‐NHC complexes in homogeneous catalysis, focusing on the relationship between catalyst structure, ligand design, and reactivity. Emphasis is placed on mechanistic insights that illustrate how NHC ligands influence catalyst stability, activation pathways, and selectivity across different reaction classes. Rather than providing exhaustive coverage, the discussion highlights representative examples that define current capabilities and limitations, and identifies design principles and challenges that are likely to shape future advances. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of ChemCatChem is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1002/cctc.70776
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      – Code: eng
        Text: English
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      – SubjectFull: Homogeneous catalysis
        Type: general
      – SubjectFull: Ligands (Chemistry)
        Type: general
      – SubjectFull: Reaction mechanisms (Chemistry)
        Type: general
      – SubjectFull: Transition metal catalysts
        Type: general
      – SubjectFull: Catalytic activity
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      – SubjectFull: Metal complexes
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      – SubjectFull: Catalyst structure
        Type: general
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      – TitleFull: Group 6 Metal NHC and CAAC Complexes in Homogeneous Catalysis: Reactivity Trends and Selected Applications.
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            NameFull: Garcia, Beatriz
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            NameFull: Bertoldo, Alberto
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            – D: 01
              M: 05
              Text: May2026
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              Y: 2026
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