Today, few water-soluble organometallic compounds are known, and little research has been done in this area. Water-soluble organometallic complexes are of interest for two reactions. First, a water-soluble compound that could be developed as a catalyst eliminates the need for organic solvents and allows the catalyst to be easily recycled. Secondly, water-soluble compounds can be introduced into biological systems, and like the water-soluble complex cisplatin may show anticancer activity. The compound, [lr(COD)(PMe3)3]CI (COD = 1,5-cyclooctadiene, Me = methyl), was synthesized and found to be water-soluble and fairly air-stable. Other water-soluble compounds, [lr(COD)(tripod)]CI, [lr(COD)(dmpe)]CI and [lrH(COD)(PMe3)3]CI2 [tripod = 1 ,1, 1-tris(diphenylphosphinomethyl)ethane, dmpe = (dimethylphosphino)ethane] were also synthesized by similar methods. All of the water-soluble compounds prepared were characterized by nmr and/or x-ray crystallography. [lr(COD)(PMe3)3]CI was found to undergo intramolecular rearrangement in solution and have a square pyramidal structure, which is unique for five-coordinate organometallic compounds. lr(COD) (tripod)]CI was also fluxional in solution, but it had the trigonal bipyramidal structure, usually observed in five-coordinate compounds. Several of the compounds synthesized were submitted to the National Cancer Institute for anticancer screening. Test results showed that the compounds exhibited some anticancer activity, but were non-selective towards a specific type of cancer. Nucleophilic addition reactions between [lr(COD)(PMe3)31CI and several nucleophiles were also studied. / Master of Science

Hydroformylation of olefins (OXO synthesis), one of the oldest organometallic catalytic reactions, continues to be of interest because of its commercial significance. Great interest recently has been placed on the development of immobilized homogeneous catalysts that combine the virtues of conventional heterogeneous and homogeneous catalysts. The objective of this dissertation is to investigate novel phosphine modified water soluble cobalt and platinum complexes as homogeneous and immobilized hydroformylation catalysts. The ligands include (1) Monodentate phosphines: P[ (CH₂ ) _n-C₆H₄-S0₃Na] ₃ (n = 0-3) and P[C₆H₄-NMe₃⁺BF₄⁻]₃; (2) Bidentate asymmetric phosphines: CHlRAPHOS(NMe₂)₄ (CHlRAPHOS = 2, 3-bis (diphenylphosphino) butane) , SKEWPHOS (NMe₂)₄ (SKEWPHOS = 2,4-bis(diphenylphospino)pentane), and DlOP(NMe₂)₄ (DlOP = 2,2-dimethyl-4,5-bis(diphenyl(phosphinomethyl)-1,3- dioxolane) ). These complexes were immobilized and/or recycled by four different methods: (1) Two phase catalysis; (2) Supported aqueous phase catalysis; (3) Catalyst supported on ion exchange resins; (4) Extraction of the catalyst from an organic phase into an aqueous phase. Catalytic results for the hydroformylation of a-olefins shows that nib (normal:branch of aldehyde product) ratio can be increased if proper alkyl-phosphine ligands are chosen. For example, as high as 18.5 of nib ratio was obtained in PtCl[P(C₆H₅)₃]₂-snCl₃ system and 5.6 in CO₂ (CO) ₆ [TRlMAPP] ₂ (TRlMAPP = trimethylamino-phenylphosphine) system. Metal leaching, from the aqueous phase to the organic phase during the catalytic reaction, was reduced by supporting the water soluble cobalt and platinum complexes onto a high surface area glass (CGP-350). For instance, 5.7% cobalt metal was found in the organic phase when CO₂(CO)₆(TPPTS)₂ was used under reaction conditions (TPPTS = triphenylphosphine trisulphonated salt). When the same cobalt complex was immobilized on glass, no cobalt metal leaching was observed. Asymmetric hydroformylation of styrene catalyzed by PtCl [SKEWPHOS (NMe₂) ₄] -SnCl₃ shows a very strong temperature dependence on optical selectivity. Enantiomeric excess (ee's) switches sign from <i><b>S</i></b> to <i><b>R</i></b> form at 57°C. At 25°C, there is 60.6% ee of <i><b>S</i></b> product, whereas 56.7% ee in favor of R product is observed at 100°C. / Ph. D.