Catalytic activity of Rh/TiO2 was influenced significantly by reduction conditions, the maximum activity per weight being obtained by reduction at 400°C for 2 h, in spite of limited adsorption abilities against reactant gases. The nature of Rh/TiO2 is sensitively modified to develop the most favorable metal-support interaction.
The rate coefficient expressions k=1013.78 exp(−99 kJ/RT) cm3 mol−1s−1 for H+C2H2→C2H+H2 and k=1013.05 exp(−12 kJ/RT) cm3 mol−1s−1 for C2H+H2→H+C2H2 were proposed after correcting for errors in previously reported data analyses of shock tube data on C2H2 pyrolysis.
A new apparatus adopting the sessile drop technique has been designed to measure the ultralow interfacial tension between two liquids of a binary mixture. The equilibrium interfacial tension of the mixture of isobutyric acid and water has been determined near its upper critical solution temperature up to the value of 0.02 μN m−1.
Stability constants of crown ether complexes with protonated primary amines were determined by the solvent extraction method. Stability constants between protonated amines(AH+) and 18-crown-6(L), logKAHL, were found to be 0.4, 0.15, 0.1, −0.05, and −0.1 for protonated methylamine, ethylamine, propylamine, butylamine, and iso-propylamine at 25.0°C, respectively.
The crystal structure of tris[μ-(1,5-diamino-3-pentanethiolato)-N,N′, μ-S]-dicobalt(III) perchlorate monohydrate was determined by the single-crystal X-ray diffraction method. The binuclear complex has a novel type of binuclear structure in which the two cobalt atoms are bridged by three thiolate sulfur atoms forming a face-shared bioctahedron.
Biogenetic-type cyclization of some isoprenoids (geranyl phenyl sulfone, methyl geranate, pseudoionone, and 6,10-dimethyl-2,5,9-undecatrien-4-one) has been performed by use of an electrogenerated acid in 1,2-dichloroethane.
On treatment with diphosphorus tetraiodide in boiling benzene followed by aqueous work-up, the title nitrogen-containing compounds undergo a reductive cleavage of the nitrogen–nitrogen bond, giving the corresponding amines in low to good yields.
Lithium enolates from 2-methylcyclohexanone and p-methylacetophenone react with allylic nitro compounds in the presence of triethylborane (2 equiv) and Pd(PPh3)4 (5 mol%) to give monoallylated compounds regioselectively.
Hexafluorodisilane has been prepared by the fluorination of hexachlorodisilane or hexabromodisilane by potassium fluoride in boiling acetonitrile, in yields approximating 45 and 60% respectively. Hexafluorodisilane has been characterised by infrared spectral data, vapour density measurements and analytical data. Both hexafluorodisilane and hexachlorodisilane are found to react with sulfur trioxide when heated to 400°C for 12 h. The products of reaction are silicon tetrafluoride, silica and sulfur dioxide with hexafluorodisilane while hexachlorodisilane in addition gives rise to hexachlorodisiloxane.