... Volume: Page: Digital Object Identifier (DOI). ... 3a, D-18059 Rostock, Germany renat.kadyrov@ degussa.com; armin.boerner@ifok.uni-rostock.de. J. Org. ... It is clear that catalysts based on (R,R)-Norphos, 6 (S,S)-Chiraphos, 7 and (R,R)-Deguphos 8 are superior. ...