10. Ai-Guo Hu, Yu Fu, Jian-Hua Xie, Hai Zhou, Li-Xin Wang, Qi-Lin Zhou*, Monodentate chiral spiro phosphoramidites: Efficient ligands for rhodium-catalyzed enantioselective hydrogenation of enamides, Angew. Chem. Int. Ed. 2002, 41, 2348-2350.