Results 61 to 70 of about 36,419 (269)

Backbone Engineering of Carbon‐Centered NHC‐Derived Diradicals: From Electronic State Tuning to High‐Performance Organic Field‐Effect Transistors

Advanced Materials, EarlyView.
The open‐shell nature of diradicals facilitates charge separation, and compounds with moderate diradical character demonstrate remarkable potential in organic field‐effect transistors (OFET) applications due to their low reorganization energies for hole and electron transport.
Xiao‐Xu Liu, Lianghui Li, Xin Li, Can Chen, Man Li, Shun Tian, Paul J. Dyson, Ying‐Feng Han   +7 more
wiley   +1 more source

Bent N‐Heterocyclic Allenes From a Well‐Defined Titanium Vinylidene Complex

Angewandte Chemie, EarlyView.
The syntheses and the structures of N‐heterocyclic allenes are reported. Allenes bearing fluorenylidene capping groups show markedly bent C═C═C units, a carbene‐like reactivity, and they can act as potent C‐donor ligands for metal complexes. ABSTRACT Allenes typically display a linear geometry. A notable exception occurs in allenes bearing two electron‐
Bastiaan Kooij, Damien W. Chen, Rosario Scopelliti, Farzaneh Fadaei‐Tirani, Kay Severin   +4 more
wiley   +2 more sources

Unprecedented directed lateral lithiations of tertiary carbons on NHC platforms [PDF]

, 2015
International audienceUnexpected and unprecedented directed remote lateral lithiation at one CH(CH3)2 of the 3-(2,6-di-isopropylphenyl) wingtip took place upon the reaction of functionalised N-heterocyclic carbene-type molecules with excess of LiCH2SiMe3,
Braunstein, Pierre, Danopoulos, Andreas A., Frison, Gilles, Rezabal, Elixabete   +3 more
core   +3 more sources

Atroposelective Construction of Axially Chiral Tetraarylethenes Via NHC‐Catalyzed Desymmetrization

Advanced Science, EarlyView.
We report the first NHC‐catalyzed atroposelective synthesis of axially chiral TAEs via oxidative desymmetrization of prochiral TAE dialdehydes. This catalytic strategy operates under mild conditions and accommodates a broad range of phenolic and nitrogen nucleophiles, delivering diverse axially chiral TAEs in good yields and up to 99% ee.
Yang‐Ze Zheng, Ting‐Rui Luan, Ming‐Hao Song, Zhaofeng Sun, Chuan‐Jun Lu, Long‐Long Xi, Ren‐Rong Liu   +6 more
wiley   +1 more source

Strategies Toward Accessing Enantioenriched (Hetero)Benzo‐Fused 5‐ and 6‐ Membered Rings via Intermolecular Carbometalation

Angewandte Chemie, EarlyView.
The use of transition‐metal catalysts and design of chiral ligands have allowed chemists to access highly functionalized benzofused 5‐ and 6‐ membered rings in high yield and enantioselectivity. A common strategy used relies on an intermolecular carbometalation across alkynes and olefins, usually followed by a subsequent intramolecular carbometalation.
Clara Jans, Armaan Grewal, Xavier Abel‐Snape, Mark Lautens   +3 more
wiley   +2 more sources

[3,3′-Dimesityl-1,1′-(4,5:16,17-dibenzo-3,6,9,12,15,18-hexaoxaeicosane-1,20-diyl)diimidazolin-2-ylidene]dithiocyanatopalladium(II)

Acta Crystallographica Section E, 2009
The coordination geometry of the Pd atom in the title compound, [Pd(SCN)2(C46H54N4O6)], is approximately square-planar. The N-heterocyclic carbene (NHC) metallacrown ether ligand binds to the Pd atom in a trans orientation through the carbene C atoms of ...
Mei-Ming Luo, Xiao-Qin Zhang
doaj   +1 more source

Desymmetrization of N-Cbz glutarimides through N-heterocyclic carbene organocatalysis

Nature Communications, 2022
Desymmetrization of achiral building blocks is one of the most efficient ways to access enantiopure compounds of synthetic relevance. Here, the authors desymmetrize glutarimides with alcohols via an imide C–N bond cleavage under NHC organocatalysis.
Zhouli Hu, Chenlong Wei, Qianqian Shi, Xianfang Hong, Jinhua Liu, Xiangui Zhou, Jinna Han, Wei Cao, Ashis Kumar Gupta, Xiaoxiang Zhang, Donghui Wei, Zhenqian Fu, Wei Huang   +12 more
doaj   +1 more source

NHC in Imidazolium Acetate Ionic Liquids: Actual or Potential Presence? [PDF]

, 2018
Ionic liquids (ILs) are considered in the majority of cases green solvents, due to their virtually null vapor pressure and to the easiness in recycling them.
Chiarotto, Isabella, Feroci, Marta, Mattiello, Leonardo, Pandolfi, Fabiana, Rocco, Daniele   +4 more
core   +2 more sources

Homoleptic and Heteroleptic Borylones L1‐B(Ph)‐L2

Angewandte Chemie, EarlyView.
Density functional theory and CCSD(T) calculations reveal that homoleptic and heteroleptic borylones L1–B(Ph)–L2 are thermodynamically accessible. Remarkably, the homoleptic borylones B(Ph)(N2)2 and B(Ph)(SPh2)2 exhibit higher bond dissociation energies than the related carbones.
Qin Ma, Wei Li, Ya Hu, Lili Zhao, Gernot Frenking   +4 more
wiley   +2 more sources

Variable coordination of amine functionalised N-heterocyclic carbene ligands to Ru, Rh and Rr: C-H and N-H activation and catalytic transfer hydrogenation [PDF]

, 2011
Chelating amine and amido complexes of late transition metals are highly valuable bifunctional catalysts in organic synthesis, but complexes of bidentate amine–NHC and amido–NHC ligands are scarce.
Arita, Blake, Boutadla, Boutadla, Brewster, Cariou, Christopher G. Daly, Corberan, Corberan, Corberan, Corberan, Cross, Davies, Grützmacher, Gürbü, Haack, Hanasaka, Hanasaka, Hanasaka, Ikariya, Ikariya, Ikariya, Ito, Ito, Ito, Ito, Ito, Jong, Kuldip Singh, Kuwata, Lalrempuia, Li, Murata, Noyori, O, O, O, Poyatos, Prades, Prades, Sandoval, Shannon, Spek, Tanabe, Viciano, Warren B. Cross, White, Youcef Boutadla, Zanardi, Özdemir   +49 more
core   +1 more source