Synonyms: Phosphine,(1,2-dimethyl-1,2-ethanediyl)bis[diphenyl-, [R-(R*,R*)]-;Phosphine,[(1R,2R)-1,2-dimethyl-1,2-ethanediyl]bis[diphenyl- (9CI);(2R,3R)-Bis(diphenylphosphino)butane;(R,R)-2,3-Bis(diphenylphosphino)butane;(R,R)-Chiraphos;CIRA;(2R,3R)-butane-2,3-diylbis(diphenylphosphane);