Phosphines, transition metal complexes containing the same...

Details Phosphines, transition metal complexes containing the same... Phosphines, transition metal complexes containing the same...

2007-11-13

2007-11-13

Eyler, Yvonne (Bonnie) (Department: 1621)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

C502S116000, C556S021000, C562S490000, C562S504000, C560S179000, C560S112000

Reexamination Certificate

active

11540166

ABSTRACT:
[PROBLEMS] To provide a method by which desired optically active carboxylic acids may be prepared from a carboxylic acid having a carbon-carbon double bond through asymmetric hydrogenation with a catalyst consisting of a transition metal complex containing a water-soluble ligand and which permits easy separation of the used catalyst from the product by liquid-liquid separation alone and enables the recovery of an expensive transition metal and the reuse of the catalyst.[MEANS FOR SOLVING PROBLEMS] Phosphines represented by the general formula (1):wherein X1is oxygen or methylene; X2is methylene, ethylene, trimethylene, 1,2-dimethylethylene, isopropylidene, or difluoromethylene; A is a Group IA alkali metal of the periodic table, hydrogen, or an ammonium ion; and a, b, c and d are each an integer of 0 or 1, with the proviso that the cases wherein the sum of a, b, c, and d is 0 are excepted.

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