Complexes of Rh(I) with phosphite derivatives of codeine

New complexes of Rh(I), [RhCl(CO)(mu-L)](2) and AcacRh(CO)L, have been obta ined with L = 1,3,2-dioxaphosphorinane containing an exocyclic codeine frag ment. The complexes were characterized by H-1-, C-13-, P-31-NMR, IR spectro scopy, plasma desorption mass spectrometry, X-ray photoelectron spectroscop y and sedimentation analysis. It was found that the chlorocarbonyl rhodium complex is a dimer with the bridge-type P,N-bidentate ligands coordinated i n the 'head to tail' mode. The same ligand in the acetylacetonate complex w as found to be P-monodentate. (C) 1999 Elsevier Science S.A. All rights res erved.