Normal and Abnormal N-Heterocyclic Carbene Ligands

Albrecht, Martin

doi:10.1016/b978-0-12-800976-5.00002-3

Cited by 46 publications

(12 citation statements)

References 182 publications

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“…Mesoionic carbene (MIC) complexes were first reported by Crabtree and Albrecht in 2001. , MICs, which do not have a neutral resonance structure, are very strong donor ligands. Prominent classes of MICs include imidazolin-4-ylidenes, 1,2,3-triazolin-4-ylidenes, and alkyl substituted pyrazolin-4-ylidenes (Figure ).…”

Section: Mesoionic Carbene Ligandsmentioning

confidence: 99%

Pushing Electrons—Which Carbene Ligand for Which Application?

2018

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This tutorial explores the diversity and characteristics of C-donor ligands. Particular emphasis is put on the conceptual design of the electronic properties for applications in coordination chemistry. More specifically, the implications of both σ and π effects are discussed. Cyclic (alkyl)(amino)carbenes as well as methanediides and carbones are brought in perspective to "conventional" N-heterocylic carbenes, mesoionic carbenes, and Fischer as well as Schrock carbene ligands.

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Section: Mesoionic Carbene Ligandsmentioning

confidence: 99%

Pushing Electrons—Which Carbene Ligand for Which Application?

2018

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“…m.in. Gaude, 1995;Schmidt, 2003;Albrecht, 2014;Greif, 2015). W przypadku studni wczesnośredniowiecznych podstawą ich podziału stały się m.in.…”

Section: Typy Studni -Konstrukcje Cembrowinunclassified

Studnia – szczególny obiekt w przestrzeni stanowiska archeologicznego. Wprowadzenie do problematyki badawczej

Piotrowska¹,

Michałowski²

2019

10.14746/fpp

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A significant increase in the amount of materials obtained from the recent large area excavations resulted in numerous finds of wells. For years, these unique archaeological features were not treated as a separate research problem. In order to obtain the fullest research results, an increasing interdisciplinarity involving different fields of science is applied to the studies on wells nowadays. Constructions made of organic raw materials are extremely rare in the space of a typical archaeological site and they are also extremely important sources for gaining knowledge about particular settlements.Wells are accompanied by a certain range of features related to the use of water intake and located in its immediate vicinity. These discoveries allow for extremely interesting interpretations of the functional connections between individual complexes of this type. Functions of wells are an issue that is inextricably linked to the location of such complexes in the settlement’s space. Another aspect related to studies of these features is their extremely rich symbolism. Wells are special archaeological features. Their uniqueness places them among the most interesting objects studied by archaeologists..

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“…However, abnormal N-heterocyclic carbenes (aNHC) are reported to be even stronger σ-donors ligands (Crabtree, 2013). This stronger σ-donors ability increase the electron density at the metal center, enhancing the propensity of the metal to undergo oxidative addition (Krueger and Albrecht, 2011; Donnelly et al, 2013; Albrecht, 2014). To the best of our knowledge, the use of aNHC-Pd complexes in DESs as reaction medium has not been explored so far.…”

Section: Introductionmentioning

confidence: 99%

Palladium Mesoionic Carbene Pre-catalyst for General Cross-Coupling Transformations in Deep Eutectic Solvents

et al. 2019

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A strong σ-donor mesoionic carbene ligand has been synthesized and applied to four different palladium-catalyzed cross-coupling transformations, proving the catalyst/medium compatibility and the increased activity of this system over previous reports in Deep Eutectic Solvent medium. Some cross-coupling processes could be carried out at room temperature and using aryl chlorides as starting materials. The possible implementation of multistep synthesis in eutectic mixtures has also been explored. The presence of palladium nanoparticles in the reaction media has been evaluated and correlated to the observed activity.

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Normal and Abnormal N-Heterocyclic Carbene Ligands

Cited by 46 publications

References 182 publications

Pushing Electrons—Which Carbene Ligand for Which Application?

Pushing Electrons—Which Carbene Ligand for Which Application?

Studnia – szczególny obiekt w przestrzeni stanowiska archeologicznego. Wprowadzenie do problematyki badawczej

Palladium Mesoionic Carbene Pre-catalyst for General Cross-Coupling Transformations in Deep Eutectic Solvents

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