No abstract

Hydrative dimerization and hydration of allenes proceeded in the presence of a ruthenium catalyst and a strong acid such as trifluoroacetic acid. γ,δ-Unsaturated ketones and methyl ketones were isolated in moderate combined yields. No isomeric compound (isomeric enone) was isolated.

Ketones P 0200Ruthenium-Catalyzed Hydrative Dimerization of Allenes. -A new hydrative dimerization of allenes (I) (6 examples) using a combination of a ruthenium catalyst and a strong acid such as trifluoroacetic acid is described and a probable reaction mechanism is proposed. -(SAITO*, S.; DOBASHI, N.; WAKATSUKI, Y.; Chem. Lett. 34 (2005) 4, 504-505; Dep. Chem., Fac. Sci., Sci. Univ. Tokyo, Shinjuku, Tokyo 162, Japan; Eng.) -F. Santoso 36-054

Organo-phosphorus compounds S 0080 Palladium-Complex-Catalyzed Regioselective Markovnikov Addition Reaction and Dehydrogenative Double Phosphinylation to Terminal Alkynes with Diphenylphosphine Oxide. -It is demonstrated that the catalyst ligand plays a key role for product distribution. -(DOBASHI, N.; FUSE, K.; HOSHINO, T.; KANADA, J.; KASHIWABARA, T.; KOBATA, C.; NUNE, S. K.; TANAKA*, M.; Tetrahedron Lett. 48 (2007) 27, 4669-4673; Chem. Resour. Lab., Tokyo Inst. Technol., Yokohama 226, Japan; Eng.) -Mais 42-169