Grafting chelating groups on 2D carbon for selective heavy metal adsorption.

Iminodiacetic acid (IDA) is a tridentate ligand, which can capture metal ions by forming two fused five-membered chelate rings. In this study, we fixed IDA moieties onto a two-dimensional nanocarbon, graphene oxide (GO), to obtain materials with high and selective adsorption of metal ions. The synthesis conditions for the GO-IDA composites were optimized, then their structures were characterized by infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and CHN elemental analysis.

Chromium carbides and cyclopropenylidenes.

Carbon tetrabromide can be reduced with CrBr in THF to form a dinuclear carbido complex, [CrBr(thf))][CrBr(thf)](μ-C), along with formation of [CrBr(thf)]. An X-ray diffraction (XRD) study of the pyridine adduct displayed a dinuclear structure bridged by a carbido ligand between 5- and 6-coordinate chromium centers. The carbido complex reacted with two equivalents of aldehydes to form α,β-unsaturated ketones.

Structural elucidation of a methylenation reagent of esters: synthesis and reactivity of a dinuclear titanium(iii) methylene complex.

Transmetallation of a zinc methylene complex [ZnI(tmeda)](μ-CH) with a titanium(iii) chloride [TiCl(tmeda)(thf)] produced a titanium methylene complex. The X-ray diffraction study displayed a dinuclear methylene structure [TiCl(tmeda)](μ-CH)(μ-Cl). Treatment of an ester with the titanium methylene complex resulted in methylenation of the ester carbonyl to form a vinyl ether.

Adsorption enhancement of nitrogen gas by atomically heterogeneous nanospace of boron nitride.

In this study, porous boron nitride (p-BN) with hexagonal phase boron nitride (h-BN) pore walls was synthesized using high-temperature calcination. Negligible variation in pore-wall structure can be observed in powder X-ray diffraction (XRD) profiles and infrared (IR) spectra. However, a highly stable p-BN with a stable pore structure even at 973 K under the oxidative conditions is obtained when synthesized at higher than 1573 K under nitrogen gas flow.

Palladium/copper-cocatalyzed decarbonylative alkynylation of acyl fluorides with alkynylsilanes: synthesis of unsymmetrical diarylethynes.

Palladium/copper-cocatalyzed decarbonylative alkynylation of acyl fluorides with alkynylsilanes is described. This reaction not only effectively inhibits the formation of undesired homocoupled products by avoiding the addition of a base, but also exhibits a wide substrate scope to provide a general access to diverse unsymmetrical diarylethynes.

Nickel/copper-cocatalyzed decarbonylative silylation of acyl fluorides.

Ni/Cu-cocatalyzed decarbonylative silylation of acyl fluorides with silylboranes has been developed to afford various arylsilanes with high efficiency and good functional-group compatibility via carbon-fluorine bond cleavage and carbon-silicon bond formation. Such transformation can not only extend the functionalization type of acyl fluorides but complement the synthetic route for arylsilanes.

Incorporation of anthraquinonyl group into lambda-Cro repressor protein for strand- and position-specific photocleavage of double-stranded DNA.

lambda-Cro repressor protein incorporated with a 2-anthraquinonylalanine (anqAla) at the 64th position was chemically synthesized by solid-phase method. The 64th position was selected according to previous information on various mutants of Cro incorporated with a single anqAla unit, that were synthesized through an Escherichia coli in vitro protein-synthesizing system. The 64anqAla mutant bound to a dsDNA of consensus operator sequence and underwent strand- and position-specific photocleavage of the dsDNA at the GG sequence after treatment with piperidine.

Rh(I)-catalyzed coupling cyclization of N-aryl trifluoroacetimidoyl chlorides with alkynes: one-pot synthesis of fluorinated quinolines.

[reaction: see text]. Rh(I) complexes were found to catalyze the coupling cyclization of N-aryl trifluoroacetimidoyl chlorides with alkynes to afford 2-trifluoromethylated quinolines in good yields. Various alkynes were applied to this cyclization coupling with regioselectivity.