| 摘要 |
The invention relates to diphosphine of formula Rl>P-(CH)n-PR2R3 wherein Rl is a bivalent radical which together with the phosphorous atom to which it is linked represents an unsubstituted or substituted 2-phospha- tricyclo[3.3.1.1{3,7}]decyl-group or a derivative thereof, wherein one or several carbon atoms are replaced by heteroatoms, R2, R3 independently represent a monovalent radical having 1 -20 atoms or a joint bivalent radica l having 2 - 20 atoms, n is 4 or 5, and the mixtures thereof as a suitable carboxylation system containing palladium or a palladium compound and said type of diphosphin. The invention also relates to a method for the carbonylation of a conjugated diene in the presence of said system.
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