(-)-6,6'-{[(1S,3S)-1,3-Dimethyl-1,3-propanediyl]bis(oxy)}bis[4,8-bis(t-butyl)-2,10-dimethoxy-bibenzo[d,f][1,3,2]dioxaphosphepin], min. 95% (S,S)-Chiraphite

Technical Note:
1. Useful catalyst for the asymmetric hyd roformylation of olefins under mild conditions. High enantio- and regios electivities have been demonstrated for several prochiral vinylarenes, and a wide variety of functional groups can be tolerated.
References: 1.J. Org. Chem., 2004. 69, 4031.
2.Organometallics, 1997. 16, 2929
3. J.Chem Soc.，DaltonTrans-1995 409. 4.J.Am Chem.Soc.，2005.127，5040.