| 摘要 |
Catalyst compositions suitable for the preparation of polymers of carbon monoxide with one or more olefinically unsaturated compounds, based on a) a group VIII metal, b) an anion of an acid having a pK A of less than 2, c) a phosphorus bidentate ligand of the general formula (R3)(R4)P-R-P(R3)(R4) in which R3 and R4 represent identical or different optionally polar substituted hydrocarbyl groups and R is a divalent organic bridging group containing at least two carbon atoms in the bridge connecting the two phosphorus atoms, and d) an acid having a pK A of at least 4 but less than 6.
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