MICs: A short modular synthesis allows the preparation of novel stable heterocycles that feature a lone pair of electrons on a carbon center. The donorproperties of these mesoionic compounds are greater than those of classical N‐heterocycliccarbenes; they are accessible by deprotonation of the corresponding conjugate acids using comparatively mild bases.
Synthesis of Highly Stable 1,3-Diaryl-1<i>H</i>-1,2,3-triazol-5-ylidenes and Their Applications in Ruthenium-Catalyzed Olefin Metathesis
作者:Jean Bouffard、Benjamin K. Keitz、Ralf Tonner、Gregorio Guisado-Barrios、Gernot Frenking、Robert H. Grubbs、Guy Bertrand
DOI:10.1021/om200272m
日期:2011.5.9
The formal cycloaddition between 1,3-diaza-2-azoniaallene salts and alkynes or alkyne equivalents provides an efficient synthesis of 1,3-diaryl-1H-1,2,3-triazolium salts, the direct precursors of 1,2,3-triazol-5-ylidenes. These N,N-diarylated mesoionic carbenes (MICs) exhibit enhanced stability in comparison to their alkylated counterparts. Experimental and computational results confirm that these
Synthesis and catalytic applications of 1,2,3-triazolylidene gold(<scp>i</scp>) complexes in silver-free oxazoline syntheses and C–H bond activation
作者:René Pretorius、Manuel R. Fructos、Helge Müller-Bunz、Robert A. Gossage、Pedro J. Pérez、Martin Albrecht
DOI:10.1039/c6dt02181f
日期:——
3-triazolylidene gold(I) chloride complexes have been synthesised and fully characterised. Silver-free methodologies for chloride ion abstraction of these complexes were evaluated for their potential as Au-based catalyst precursors. Using simple potassium salts or MeOTf as chloride scavengers produced metal complexes that catalyse both the regioselective synthesis of oxazolines and the C–H activation of benzene
The present invention provides novel and stable crystalline 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes. The present invention also provides methods of making 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes. The present invention also provides methods of using 1H-1,2,3 triazolium carbenes and metal complexes of 1H-1,2,3 triazolium carbenes in catalytic reactions.