956257-34-4Relevant academic research and scientific papers
Highly recoverable pyridinium-tagged Hoveyda-Grubbs pre-catalyst for olefin metathesis. Design of the boomerang ligand toward the optimal compromise between activity and reusability
Rix, Diane,Caijo, Frederic,Laurent, Isabelle,Gulajski, Lukasz,Grela, Karol,Mauduit, Marc
, p. 3771 - 3773 (2008/03/14)
Whereas the boomerang ligand of Hoveyda-Grubbs pre-catalysts can be modified by attachment of a pyridinium tag to its benzylidene moiety, a precise adjustment of the length of the spacer allows the optimum balance to be reached between the activity of the
Ruthenium olefin metathesis catalysts with modified styrene ethers: Influence of steric and electronic effects
Zaja, Mirko,Connon, Stephen J.,Dunne, Aideen M.,Rivard, Michael,Buschmann, Nicole,Jiricek, Jan,Blechert, Siegfried
, p. 6545 - 6558 (2007/10/03)
A series of olefin metathesis catalysts with modified isopropoxybenzylidene ligands were synthesised, and the effects of ligands on the rate of metathesis investigated. Increased steric hinderance ortho to the isopropoxy group enhanced reaction rates. In the case of N-heterocyclic carbene complexes, decreasing electron density at both the chelating oxygen atom and the Ru=C bond accelerated reaction rates appreciably. Catalysts containing a tricyclohexylphosphane ligand, followed the same trend with regard to benzylidene electrophilicity, while higher electron density at oxygen enhanced reaction rates.
