Production of optically active phospholanes

The invention describes novel optically active phospholanes and bisphospholanes, the preparation thereof and use thereof as ligands in metal complexes, and the use of the metal complexes for enantioselective synthesis. Phospolanes and diphospholanes of the general formula I where:is H, C-C-aryl, alkylaryl, SiR,Ris alkyl or aryl,A is H, C-C-alkyl, aryl, Cl or B is a linker with 1-5 C atoms between the two P atoms, and their use as catalyst in asymmetric synthesis.