Experimental and computational investigations of anti‐Bredt amidiniumsalts are presented. Calculations show that the pyramidalization of an amino group can significantly destabilize the formal carbocation center of amidiniums, due to the decreased π donation. In some cases, the unfavorable ‐I effect of nitrogen surpasses its beneficial +M effect, and amidiniums become less stable than iminiums. It is shown that
Anti-Bredt N-heterocyclic carbene: an efficient ligand for the gold(i)-catalyzed hydroamination of terminal alkynes with parent hydrazine
作者:María J. López-Gómez、David Martin、Guy Bertrand
DOI:10.1039/c3cc41279b
日期:——
An anti-Bredt N-heterocyclic carbenegold(I) chloride complex was synthesized by taking advantage of the reversible insertion of the free carbene into the NH bond of hexamethyldisilazane. This precatalyst promotes the parenthydrazine hydroamination of terminal alkynes at room temperature.