| abstract |
The invention concerns a method for separating (d/l) and (meso) diastereoisomers of bis-[1-phospha- 2,3-diphenyl- 4,5-dimethylnorbornadiene]. The invention also concerns a method for preparing optically active diphosphines of bis- [1-phospha-2,3 -diphenyl-4,5 -dimethylnorbonadiene]. The bis- [1-phospha- 2,3-diphenyl-4,5 -dimethylnorbonadiene] diastereoisomers are separated by a method which consists in transforming the mixture of bis- [1-phospha- 2,3-diphenyl-4,5 -dimethylnorbonadiene] diastereoisomers into a mixture of the corresponding diphosphine dioxide or disulphide, then in separating the two diastereoisomers in the form of dioxide and disulphide. |