| Abstract: | Basic Metals. XIII. A New Synthesis of Cyclopentadienylrhodium Phosphonate from Cyclopentadienylrhodium Phosphite Complexes C5H5RhP(OCH3)3]2 reacts with alkali metal iodides MI (M = Li, Na, K) in two stages via the intermediate C5H5RhCH3P(O)(OCH3) 2]P(OCH3)3 to the corresponding bisphosphonate complexes C5H5RhCH3P(O)(OCH3) 2]2M. Their properties suggest that they exist as contact ionpairs rather than dissociated ions. The reaction of C5H5RhCH3P(O)(OCH3)2]2 Na with HCl in benzene yields the complex C5H5RhCH3P(O)(OCH3) 2]2H, in which a chelate ligand with a P? O? H? O? P bridge is probably present. The acidic character of the bridging H atom is shown in the reaction with (CH3)3PCH2 which leads to C5H5RhCH3{P(O)(OCH3) 2}2]P(CH3)4]. C5H5RhCH3P(O)(OCH3) 2]2Tl was formed in the reaction of C5H5RhCH3P(O)(OCH3)2]2 H and thallium acetylacetonate. The n.m.r. spectra of the new phosphonate complexes are discussed. |
