2,5-Dimethyl-3,4-bis[(2R,5R)-2,5-dimethylphospholano]thiophene: first member of the hetero-DuPHOS family. - Benincori T; Pilati T; Rizzo S; Sannicolò F; Burk MJ; de Ferra L; Ullucci E; Piccolo O (The Journal of organic chemistry, 2005)