TY  - JOUR
PY  - 2008//
TI  - Thermal Decomposition Modes for Four‐Coordinate Ruthenium Phosphonium Alkylidene Olefin Metathesis Catalysts
JO  - Chemistry: a European journal
A1  - Leitao, Erin M
A1  - Dubberley, Stuart R
A1  - Piers, Warren E
A1  - Wu, Qiao
A1  - McDonald, Robert
SP  - 11565
EP  - 11572
VL  - 14
IS  - 36
N2  - The four-coordinate ruthenium phosphonium alkylidenes 1-Cy and 1-iPr, differing in the substituent on the phosphorus center, were observed to decompose thermally in the presence of 1,1-dichloroethylene to produce [H3CPR3][Cl]. The major ruthenium-containing product was a trichloro-bridged ruthenium dimer that incorporates the elements of the 1,1-dichloroethylene as a dichlorocarbene ligand and a styrenic vinyl group on the supporting NHC ligand. Spectroscopic, kinetic, and deuterium-labeling experiments probed the mechanism of this process, which involves a rate-limiting C–H activation of an NHC mesityl ortho methyl group. These studies provide insight into intrinsic decomposition processes of active Grubbs type olefin metathesis catalysts, pointing the way to new catalyst design directions.<p /> 
LA  - 
SN  - 0947-6539
UR  - http://dx.doi.org/10.1002/chem.200801584
ID  - ref1
ER  -