Kinetic isotope effect during acid hydrogen exchange in σ-benzyl-π-cyclopentadienyliron dicarbonyl

Conclusions The kinetic isotope effect K_D/K_T was measured during acid hydrogen exchange in -C₅H₅-(CO)₂Fe--CH₂C₆H₅. The obtained K_D/K_T value testifies in support of the generality of the mechanisms of hydrogen exchange in the benzene ring of this complex and in other derivatives of the benzene series.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 221–222, January, 1979.     

Formation of benzofuran and 2H-chromene structures in one reaction. A novel synthesis of 2H-chromene derivatives

Heating the morpholinal of nitrosalicylic aldehyde with methyl propiolate in acetonitrile in the presence of Cul affords an equimolar mixture of 2-methoxycarbonylmethyl-3-morpholino-5-nitrobenzofuran and 3-methoxycarbonyl-2-morpholino-6-nitro-2H-chromene, the structures of which were determined by X-ray analysis. Only the 2H-chromene mentioned above was obtained in the absence of Cul and solvent.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 1222–1228, May, 1996.     

A neutron spin-echo study of the dynamics of star-shaped polymers (with polystyrene arms grafted to C60) in solutions and in the bulk

Methods of small-angle and inelastic neutron scattering were used to study star-shaped polymers obtained by grafting polystyrene to fullerene C₆₀ (six arms with an elementary mass M=5×10³). The behavior of stars in the solution and bulk was compared with the dynamics of free molecules of polystyrene with a mass equal to the mass of an arm. The slow dynamics of arms in the ranges of times t=0.01–20 ns, momentum transfers q=0.2–0.6 nm^?1, and temperatures T=20–60°C does not obey the simple models of Rouse and Zimm. The interaction of the rays with the C₆₀ fullerene under the conditions of the specific geometry of the macromolecule leads to unusual oscillations of time correlations in the arms of stars.     

Synthesis of 4-nitrosopyrazoles from N-substituted N-nitrosohydrazines

Reaction of N-nitrososubstituted propyl- and benzylhydrazines with acetylacetone gives the corresponding 4-nitrosopyrazoles.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 337–339, March, 1989.     

A high-power single-pulse laser with stabilized spectrum and directivity near the diffraction limit

Journal of Applied Spectroscopy -