Insight into the Activation of In Situ Generated Chiral RhI Catalysts and Their Application in Cyclotrimerizations
Sprache des Titels:
We report a detailed study concerning the efficient
generation of highly active chiral rhodium complexes
of the general structure [Rh(diphosphine)(solvent)2]+ as well
as their exemplary successful utilization as catalysts for cyclotrimerizations.
Such solvent complexes could likewise be
prepared from novel ammonia complexes of the type [Rh(diphosphine)(
NH3)2]+. A valuable, feasible approach to generate
novel chiral RhI complexes was found by in situ generation
from Wilkinson?s catalyst [RhCl(PPh3)3] with chiral P,N ligands.
The generated catalysts led to moderate to good
enantioselectivities and excellent yields in the cyclotrimerizations
of triynes, showcasing their usefulness in the synthesis
of axially chiral benzene derivatives.