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