We propose stable layered structures and ultrathin tubular configurations of titanium oxide (TiO 2 ) nanomaterials on the basis of first-principles calculations within density functional theory. The thinnest TiO 2 nanosheet is characterized by a reconstructed (001) bilayer of rutile TiO 2 , while ultrathin TiO 2 nanotubes can be built by rolling up a TiO 2 NS. These nanotubes are predicted to have high stability, large Young's modulus, and tunable electronic properties. A possible synthetic route toward these nanostructures is also presented.

An efficient method of Pd(II)-catalyzed P(O)R(1)R(2)-directed asymmetric C-H activation and dynamic kinetic resolution for synthesis of chiral phosphinate ligands has been performed and exhibits a wide scope of substrates and an excellent diastereomeric ratio (>95:5).

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Disclosed herein is a direct C−H trifluoromethylation of quinoxalin‐2(1H)‐ones with sodium trifluoromethanesulfinate. This protocol affords a series of 3‐trifluoromethylquinoxalin‐2(1H)‐one derivatives in moderate to excellent yields under transition‐metal‐free conditions. The present methodology features utilization of the inexpensive trifluoromethyl source without transition‐metal‐catalysts, mild reaction conditions and high functional group tolerance, which promises a convenient and efficient access to pharmaceutically interesting quinoxalinones.magnified image

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