TetraMe-BITIANP-Ru complex

CH2CI2 occurs 9.8-fold faster than that of the S isomer, and the equilibration between the enantiomeric substrates is 4.4-fold faster than hydrogenation of the slow-reacting S substrate. On the other hand, hydrogenation of racemic 3-acetyltetrahy-drofuran-2-one catalyzed by the cationic (l )-BINAP-RuCl()7 -C6H6) complex gives the 3S,ri syn) alcohol in up to 97% e.e. (Eq. 2.22) [120, 158bj. A similar result is obtained by use of a tetraMe-BITIANP-Ru complex [49]. 

---