The adsorption of Cu(II) on oxidized multi-walled carbon nanotubes (oMWCNTs) as a function of contact time, pH, ionic strength, temperature, and hydroxylated fullerene (C60(OH)n) and carboxylated fullerene (C60(C(COOH)2)n) were studied under ambient conditions using batch techniques. The results showed that the adsorption of Cu(II) had rapidly reached equilibrium and the kinetic process was well described by a pseudo-second-order rate model. Cu(II) adsorption on oMWCNTs was dependent on pH but independent of ionic strength. Compared with the Freundlich model, the Langmuir model was more suitable for analyzing the adsorption isotherms. The thermodynamic parameters calculated from temperature-dependent adsorption isotherms suggested that Cu(II) adsorption on oMWCNTs was spontaneous and endothermic. The effect of C60(OH)n on Cu(II) adsorption of oMWCNTs was not significant at low C60(OH)n concentration, whereas a negative effect was observed at higher concentration. The adsorption of Cu(II) on oMWCNTs was enhanced with increasing pH values at pH < 5, but decreased at pH ≥ 5. The presence of C60(C(COOH)2)n inhibited the adsorption of Cu(II) onto oMWCNTs at pH 4–6. The double sorption site model was applied to simulate the adsorption isotherms of Cu(II) in the presence of C60(OH)n and fitted the experimental data well.

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Compounds. -The novel method is highly efficient for the preparation of various dibenzodiazepines. Only amination products are formed when substrates such as (IV) or (VI) are used. -(YANG, M.; WU, L.; SHE, D.; HUI, H.; ZHAO, Q.; CHEN, M.; HUANG*, G.; LIANG, Y.; Synlett 2008, 3, 448-452; State Key Lab. Appl. Org. Chem., Lanzhou Univ., Lanzhou, Gansu 730000, Peop. Rep. China; Eng.) -Mais 24-160

A one-step synthesis of dibenzo-fused seven-membered nitrogen heterocycles from acetophenones/benzophenones and 2haloanilines, via a copper-catalyzed amination, was developed. The reaction involves amination followed by intramolecular cyclization.

Simple Selective Synthesis of 2,4-and 2,6-Diarylpyridines Through Metal-Free Cyclocondensation of Aromatic Ketones with Ammonium Acetate. -Under optimized conditions, acetophenones (I) and analogous ketones (III) afford 2,4-and 2,6-diarylpyridines, respectively. -(LIU, J.; WANG, C.; WU, L.; LIANG, F.; HUANG*, G.; Synthesis 2010, 24, 4228-4234, http://dx.