| 摘要 |
Disclosed are bis-phosphine compounds having the general formula <IMAGE> wherein: each of A1, A2, A3 and A4 is an arylene radical wherein (i) each phosphorus atom P is bonded to a ring carbon atom of A1 and A2 and to a ring carbon atom of A3 and A4, (ii) A1 and A2, and A3 and A4 are bonded to each other by ring carbon atoms and (iii) each of the residues <IMAGE> constitutes a 5-membered ring; each of A5 and A6 is an arylene radical wherein A5 and A6 are bonded to each other and to residues R1-C-R2 and R3-C-R4 by ring carbon atoms and R1-C-R2 and R3-C-R4 are connected to each other through a chain of 4 carbon atoms; and R1, R2, R3 and R4 each represents hydrogen or a hydrocarbyl radical containing up to about 8 carbon atoms. Also disclosed are catalyst systems comprising one or more of the above phosphine compounds and rhodium, catalyst solutions comprising one or more the above phosphine compounds, rhodium and a hydroformylation solvent, and hydroformylation processes wherein olefins are contacted with carbon monoxide, hydrogen and the catalyst solution to produce aldehydes.
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