Novel Intramolecular C-Aryl-S Bond Activation by an Electron Rich, Ring-Expanded-NHC-Rh centre: A Combined Experimental and DFT Study

作者：Binobaid Abeer; Cavell Kingsley J^*; Nechaev Mikhail S; Kariuki Benson M

来源：Australian Journal of Chemistry, 2011, 64(8): 1141-1147.

DOI：10.1071/CH11243

The reaction of (o-MeSPh)-N-functionalized tetrahydropyrimidinium salts with KN(SiMe3)(2) and [Rh(COD)Cl](2) in THF leads to the formation of a novel dimeric Rh-III bis-carbene complex. The reaction involves the unexpected cleavage/oxidative addition of the aryl-sulfur bond to give dimeric metallated Rh-III with bridging MeS, moieties. This unusual reaction is probably a consequence of the sterically imposing structure and strong donor capacity of ring-expanded N-heterocyclic carbenes (RE-NHCs). An X-ray structure of the [(Ph,DIPP-NHC)Rh(Cl)(SMe)(2)] product complex has been obtained, and DFT studies were undertaken to gain an insight into the reaction pathway.

• 出版日期2011