Reaction of the lithiated N-heterocyclic carbene [:C[N(2,6-(i)Pr2C6H3)]2(CH)CLi]n (LiIPr) with KO(t)Bu in diethylether (Et2O) afforded the novel organo-potassium compound [:C[N(2,6-(i)Pr2C6H3)]2(CH)CK(THF)2] (KIPr·2THF). Both LiIPr and KIPr can be interpreted as ditopic carbanionic carbenes (or alkali metal salts of anionic "dicarbenes") and are interesting precursors for the synthesis of novel...

The potential energy surfaces for the chemical reactions of group 14 carbenes have been studied using density functional theory (B3LYP/LANL2DZ). Five saturated five-membered-ring N-heterocyclic carbene Dipp[upper bond 1 start]N(CH(2))(2)N(Dipp)E[upper bond 1 end]: (five-ring-E:) species, where E = C, Si, Ge, Sn and Pb, have been chosen as model reactants in this work. Also, four kinds of chemic...

We herein summarize our recent results on the design and application of metal complexes that bear N-phosphine-oxide-substituted imidazolylidenes (PoxIms), in which volume shape reaction space around carbene atoms can be drastically changed via rotation N-phosphinoyl groups; this phenomenon is discussed detail based experimental theoretical results. also discuss PoxIms to implement frustration r...

Combining N-heterocyclic carbenes with gold nanoparticles provides an ultrabright and fragment-free ionization platform for laser-desorption mass spectrometry. In their Research Article (e202219182), David M. Jenkins, Jon P. Camden, co-workers show that NHC-functionalized can “give wings” in the spectrometer, enabling next-generation applications of barcoding, data storage, bioconjugation react...

Chiral N-heterocyclic carbenes (NHCs) promote the asymmetric formal [4 + 2] cycloaddition of alkylarylketenes with β,γ-unsaturated α-ketocarboxylic esters and amides. Divergent diastereoselectivity is observed in this process, with γ-aryl-β,γ-unsaturated α-ketocarboxylic esters and amides giving preferentially syn-dihydropyranones (up to 68 : 32 dr syn : anti, up to 98% ee), while γ-alkyl-deriv...

N-heterocyclic carbenes (NHCs) represent a leading class of ligands in organometallic chemistry, but have been rarely exploited as stabilizers for metal nanoparticles (NPs). We report the first example of NHC stabilized Pd-NPs that demonstrate long term stability. These NHC Pd-NPs were synthesized by a facile ligand exchange protocol using rationally designed long chained NHCs (LC-NHCs). Furthe...

N-heterocyclic carbenes (NHCs), typically derived from imidazolium salts, have provided highly powerful ligands for catalysis. Recently, abnormal C4 bonding rather than normal C2 bonding has been discovered as a new carbene bonding mode. We were interested in comparing the consequences of these two bonding modes on the metal center. Therefore we synthesized related palladium complexes 1 and 2 c...

The preparation of a 1,3-bis(2,6-terphenyl)imidazol-2-ylidene, IDitop (Ditop=2,6-bis(4-tolyl)phenyl-) is reported. Several late transition metal complexes as well the selenium adduct were prepared to study and compare stereoelectronic properties other well-known N-heterocyclic carbenes (NHCs). A steric character taken from crystal structure data adducts reveals high degree flexibility. Prelimin...

N-heterocyclic carbenes have initially attracted great attention of the chemists in consequence their catalytic activity. The favorable results were also obtained bioactivity studies for carbenes, and transition metal complexes following years. Theoretical methods deliver beneficial data about several activities molecules. One them is frontier orbital analysis, which supplies reactivity Another...

Novel complexes 1 and 2 based on N-heterocyclic carbenes, which are analogous to Ru(bpy)(3)(2+) and Ru(terpy)(2)(2+), respectively, were synthesized. The complex, which is analogous to Ru(terpy)(2)(2+), exhibited promising photoluminescence properties with a long lifetime of 820 ns in acetonitrile and 3100 ns in water at room temperature, respectively. In addition, ab initio calculations were c...