A series of modified Hoveyda–Grubbs catalysts incorporating a chelating iodo-benzylidene ligand were prepared and characterized. The presence of electron-withdrawing ring substituents in the para position to the iodide was found to decrease the catalytic activity, revealing that dissociation of the Ru⋯I–Ar bond is not the rate-determining step.
COPPER CATALYZED HALOGENATON AND REACTION PRODUCTS
申请人:Wisconsin Alumni Research Foundation
公开号:US20140371480A1
公开(公告)日:2014-12-18
A Cu(I)-catalyzed 1,3-halogen migration reaction effectively recycles an activating group by transferring a halogen from an sp
2
to a benzylic carbon with good enantioselectivity and concomitant borylation of the Ar-halo bond. The resulting enantio-enriched benzyl halide can be reacted in the same vessel under a variety of conditions to form an additional carbon-heteroatom or carbon-carbon bond while maintaining high ee. The reaction can be used to efficiently prepare novel compounds and intermediates for the preparation of therapeutics and ligands for catalysis.
New Complexes of Ruthenium, Method for Their Preparation, and Their Application in Olefin Metathesis Reactions
申请人:Grela Karol
公开号:US20140171607A1
公开(公告)日:2014-06-19
The present invention provides new ruthenium complexes of Formula (1), which contain a chelate ring created by a halogen atom X. The invention concerns also a method for the preparation of the new ruthenium complexes and their application in metathesis reactions.