Mesoionic N‐Heterocyclic Olefins, Imines, Thiones, Phosphinidenes and Their Application in Catalysis
Subir Maji, Sreejyothi P, Max M. Hansmann, Swadhin K. Mandal
TL;DR
This paper reviews recent progress in using mesoionic N-heterocyclic compounds as metal-free catalysts for chemical reactions.
Contribution
The paper highlights novel mesoionic ligands derived from p-block elements and their catalytic applications.
Findings
Mesoionic N-heterocyclic compounds show reactivity similar to transition metal complexes.
These compounds are effective as metal-free catalysts for organic transformations.
Recent breakthroughs in their synthesis and catalytic uses are documented.
Abstract
Transition metal compounds are widely known for their ability to activate small molecules and are excellent catalysts for a wide range of reactions. However, environmentally friendly and cost‐effective alternatives are highly desirable due to their toxicity and low abundance. In recent years, there has been a significant surge in the study of main‐group‐based species, mainly p‐block element‐derived compounds, which revealed reactivity resembling that of transition metal complexes. Recently, the mesoionic N‐heterocyclic carbenes (mNHCs) adducts of p‐block elements, containing exocyclic fragments such as ═CH2 (mNHOs), ═NR (mNHIs), ═PR (mNHPs), and ═S (mNHTs), have evolved as ligands for coordination chemistry, reactive species for the activation of small molecules, as well as efficient metal‐free catalysts for various challenging organic transformations, driven by their strong…
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Taxonomy
TopicsN-Heterocyclic Carbenes in Organic and Inorganic Chemistry · Catalytic Cross-Coupling Reactions · Organometallic Complex Synthesis and Catalysis