Abstract New C s-symmetric aryl 1, 4-diphosphine ligands were synthesized and tested in the copolymerization of carbon monoxide and propene. The electronic properties of the two different P-atoms did not affect the high enantioselectivity of the catalyst precursors, thus resulting in high 'regio'-and 'stereoregular'copolymers.
![dicyclohexyl-[[2-(diphenylphosphanylmethyl)phenyl]methyl]phosphane Structure](https://image.chemsrc.com/caspic/100/850894-39-2.png)