Preface. NATO Advanced Research Workshop on aqueous organometallic chemistry and catalysis in Debrecen, Hungary; L.T. Horvath. The catalytic properties of water soluble phosphine complexes; M.T. Beck. Early work on catalysis by water soluble transition metal phosphine complexes; F. Joo. Summery of the round table discussion of the state of the art and future directions of aqueous organometallic chemistry and catalysis; L.T. Horvath, F. Joo. Transition metal catalyzed reactions of olefins in water: olefin metathesis and isomerization; R.H. Grubbs. Aqueous organometallic chemistry: effects of a reactive solvent; F. Joo, et al. Aqueous chemistry and catalytic activity of organometallic iridium complexes; J.S. Merola, et al. Organometallic radical chemistry in aqueous solution; D.R. Tyler. The use of 1,3,5-triaza-7-phosphaadamantane (PTA), a water-soluble, air stable ligand, in organometallic chemistry and catalysis; D.J. Darensbourg, et al. Recent developments in metal catalyzed biphasic reactions; V. Grushin, A. Alper. Counter phase transfer catalysis by water-soluble phosphine complexes; T. Okano. Metal-catalyzed hydrophosphination as a route to water-soluble phosphines; P.G. Pringle, et al. Aqueous media in the intramolecular Heck reaction; D.B. Grotjahn, X. Zhang. New efficient water-soluble catalysts for two-phase olefin hydroformylation; W.A. Herrmann, et al. Rhodium and Palladium water-soluble complexes in the carbonylation reactions. Improvements in the transfer between the organic and aqueous phases; F. Monteil, et al. New water soluble phosphines for organometallic chemistry and catalysis in the aqueous phase; B.E. Honson, et al. Hexaaquaruthenate(II) as a catalyst precursor in aqueous organometallic catalysis; A. C. Beyei. Ruthenium-catalyzedoxidation of chlorinated hydrocarbons in aqueous medium; M. Bressan. Hydrosoluble ligands for a new technology; E.G. Kuntz. Comparative study of biphase reduction of carbonyl compounds catalyzed by homogeneous and water soluble Ru catalysts; S. Sabata, et al. Three approaches to catalytic aqueous organometallic chemistry involving water soluble ligands, some modified cyclodextrins as ligands, and reactions in an aluminophosphate cavity; W.R. Jackson, et al. Models for supported aqueous-phase catalysis; I. Toth, et al. Stoichiometric and exhaustive hydrolysis of N,N-dialkylcarbamates; D. Belli Dell'Amico, et al. Composite hydrogels of the polysaccharide/polyvalent metal type; T. Spychaj, et al. Organometallic catalysis in water and in a two-phase system; D. Sinou. Chiral sulfonated phosphines in enantioselective catalysis; J. Bakos. Asymmetric complex catalysis in micellar systems; G. Oehme, et al. Bioorganometallic chemistry: the reaction of a 5-pentamethylcyclopentadienyl)rhodium aqua complex with nucleobases, nucleosides, nucleotides, and oligonucleotides; R.H. Fish, et al. On nature's aqueous organometallic and radical chemistry with B12-derivatives; B. Krautler. Catalytic hydrogenation of biological membranes: the effects on membrane physical state and functions; L. Vigh, F. Joo. Aqueous phospholipid dispersions as vectors for selective homogeneous catalysis; P.J. Quinn. Modification of biomembranes by catalytic hydrogenation; L. Nadasdi, et al. Subject index.