| 摘要 |
Novel catalyst compositions, characterized in that they are based upon
a) a palladium compound,
b) a non-noble transition 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) a quinone, if desired.
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