| 摘要 |
A catalyst system which comprises: a) a group VIII metal compound, and b) a monophosphine of formula <IMAGE> (I) where R1 represents an aliphatic hydrocarbyl group, R2 represents an optionally substituted aromatic heterocyclic group having 5 or 6 ring atoms of which at least one is nitrogen, which may form part of an optionally substituted larger condensed ring structure, and R3 independently has the meaning of R2 or represents an optionally substituted aryl group or an acid addition salt thereof, and their use in the carbonylation of unsaturated compounds.
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