hindered biaryls efficiently, a series of NHC-Pd(II)-azole complexes bearing sterically hindered ligands were synthesized and characterized. The steric environment effect as well as the electronic effect of the azole ligands has been assessed. All these complexes were applied in the Suzuki−Miyaura cross-coupling reaction of sterically hindered arylchlorides with low catalysts loadings (0.1 mol %) under
[EN] EFFICIENT CATALYST FOR THE FORMATION OF POLYARYL HYDROCARBONS SUITABLE AS PRECURSORS FOR POLYDENTATE ORGANOPHOSPHORUS CATALYST LIGANDS<br/>[FR] CATALYSEUR EFFICACE POUR LA FORMATION D'HYDROCARBURES POLYARYLE APPROPRIÉS EN TANT QUE PRÉCURSEURS POUR DES LIGANDS DE CATALYSEURS ORGANOPHOSPHORÉS POLYDENTÉS
申请人:EASTMAN CHEM CO
公开号:WO2018044824A1
公开(公告)日:2018-03-08
The disclosure relates to the efficient preparation of aromatic hydrocarbons useful as intermediates for di-, tri-, tetra- and poly-dentate organophosphorus ligands having value in particular as hydroformylation catalysts. The use of triarylphosphine halide catalysts have been found to be more efficient in forming these intermediates by the use of excess triarylphosphine in an amount beyond what is required to form a coordination complex.