| 摘要 |
<p>Novel catalyst compositions, caracterized in that they are based on a) a palladium compound, b) a main group metal salt of an acid with a pKa of less than 2, provided that the acid is not a hydrohalogenic acid, or a mixture of such a salt and such an acid, c) a bidentate ligand of the general formula R<1>R<2>-M-R-M-R<3>R<4>, wherein M represents phosphorus, arsenic or antimony, R<1>, R<2>, R<3> and R<4> represent hydrocarbyl groups which may or may not be substituted with polar groups and R represents a bivalent organic bridging group having at least two carbon atoms in the bridge, and d) an ester or a ketone. n</p> |
