A series of novel chiral N-heterocyclic carbene rhodium complexes (NHC–Rh) based on benzimidazole have been prepared, and all of the NHC–Rh complexes were fully characterized by NMR and mass spectrometry. These complexes could be used as catalysts for the asymmetric 1,2-addition of organoboronic acids to aldehydes, affording chiral diarylmethanols with high yields and moderate enantioselectivit...

Herein we report robust methods for the preparation and full characterisation of a range of Ir(I) and Rh(I) fluoride and bifluoride complexes using N-heterocyclic carbenes (NHCs) as ancillary ligands. The processes that link the fluoride and the bifluoride species are investigated and reports of the first Ir-bifluoride and Ir(I)-NHC and Rh(I)-NHC trifluoromethyl complexes are revealed.

Functionalization of the C4 carbon of an imidazol-derived N-heterocyclic carbene (NHC) may allow fine-tuning of the electronic and steric properties of the C2 carbene center. A facile route to silyl-functionalized di-N-heterocyclic carbenes (Di-NHCs) is described. Treatment of the polymeric lithiated NHC, {Li(IPrH)}n (1) (Li(IPrH) = {(N-2,6-iPr2C6H3)2CHCLi}C:) with a dichlorosilane affords mono...

An efficient and versatile synthetic approach to NHC-based organometallic polymers has been developed by a simple three-step synthesis. A novel brush polymer having imidazolium salt side chains (P2) was firstly synthesized through postpolymerization modification of P1, which permits access to Ag(I)-NHC-based side chain polymer (P3) at room temperature in high yield. P3 was applied as a carbene ...

Bis-N-heterocyclic carbenes Pd0 complexes, Pd(NHC)2, are efficient catalysts in Heck reactions performed with aryl bromides or chlorides. The Pd(NHC)2 that are not stable are generated in situ from PdII precursors PdY2(NHC)2 (Y = halides) after a chemical reduction. The latter procedure can be mimicked by an electrochemical reduction. The transient Pd(NHCBn)2 is generated by electrochemical red...

Chapter 1 gives the reader a background on cross-coupling reactions, in particular palladium mediated couplings. Furthermore the importance of ligands, including phosphines and N-heterocyclic carbenes (NHC), in such cross-coupling reactions is explored. Chapter 2 provides a background to the reductive lithiation of phosphines, followed by an account of our investigation of BINAP functionalisati...

Abstract The reactions of the N‐heterocyclic carbene‐parent phosphinidene adducts (IMes)PH ( 1 a ) and (IDipp)PH b with one equivalent copper(I) or silver(I) chloride afforded monometallic complexes [{(IMes)PH}MCl] 2 , M=Cu; M=Ag) [{(IDipp)PH}MCl] 3 M=Ag). Single‐crystal X‐ray diffraction analyis provided evidence for higher tendency ligand to form polynuclear structures bridging NHC‐phosphinid...

An oxidative γ-functionalization of enals under N-heterocyclic carbene (NHC) catalysis to give unsaturated δ-lactones is disclosed. Enantioselectivity control involving the relatively remote enal γ-carbon was achieved via Lewis acid [Sc(OTf)(3) or combined Sc(OTf)(3)/Mg(OTf)(2)] and NHC cooperative catalysis.

•Apply a DFT of length dTi to the quasi-periodic sequence: –Harmonic frequencies: k = lTi, l = 1, 2, . . . , d –Non-harmonic frequencies: k + 1, k + 2, . . . , k + Ti − 1, where k = 1, Ti, 2Ti, . . . , (d − 1)Ti •Non-harmonic content (NHC) in statistically generated phonemes is much lower, compared to NHC in natural phonemes. Improving Speech Features Dynamics Learning Non-Harmonic Components S...

New procedures for the synthesis of [Au(NHC)(OH)] are reported. Initially, a two-step reaction via the digold complex [{Au(NHC)}(2)(μ-OH)][BF(4)] was probed, enabling the preparation of the novel [Au(SIPr)(OH)] complex and of its previously reported congener [Au(IPr)(OH)]. After further optimization, a one-step procedure was developed.