| 摘要 |
Catalyst compositions comprising a Group VIII metal and a compound of the general formula <CHEM> wherein X<1> and X<2> are the same or different elements chosen from sulphur and selenium, Y is a bivalent bridging group containing at least one carbon or nitrogen atom in the bridge, and R<1>, R<2>, R<3> and R<4> are the same or different, optionally polar substituted, hydrocarbyl groups, are useful for the preparation of copolymers of carbon monoxide and one or more olefinically unsaturated compounds. |
