Beilstein J. Org. Chem.2005,1, No. 3, doi:10.1186/1860-5397-1-3
using a 1:1 mixture of triphenylphosphine and a certain phosphinine (substituted phospha-benzene), 95% regioselectivity in favor of C-Cbondformation at the higher substituted C-atom was achieved, whereas the use of the pure ligands as traditional homo-combinations led to low degrees of