abstract |
Optically active diphosphines of the formula: R1 CH2-CH-CH2-P ANGLE ¦¦R2 ¦¦ ¦¦R1' CH2-CH-CH2-P ANGLE R2' in which the phosphinomethyl groups are trans to each other, from rhodium complexes useful as catalysts in hydrogenating substituted acrylic acids and their esters to optically active propionic acid derivatives. |