| 摘要 |
Novel catalyst composition, characterized in that they are based upon a) a palladium compound, b) an anion of an acid with a pKa of less than 2, with the proviso that the acid is not a hydrohalogenic acid, c) a bisphosphine of the general formula R1R2P-R-PR3R4. wherein R1-R4 are similar or dissimilar hydrocarbyl groups which may or may not be substituted with polar groups, with the proviso that at least one of the groups R1-R4 represents a polarly substituted aryl group containing at least one polar substituent on a position ortho to phosphorus, and wherein R represents a bivalent organic bridging group containing at least two carbon atoms in the bridge, and d) optionally, a quinone. |
