42,008 research outputs found
Palladium-catalyzed difluoromethylation of heteroaryl chlorides, bromides and iodides.
A palladium-catalyzed difluoromethylation of a series of heteroaryl chlorides, bromides and iodides under mild conditions is described. A wide range of heteroaryl halides such as pyridyl, pyrimidyl, pyrazyl, funanyl, thienyl, pyazolyl, imidazolyl, thiazolyl, and oxazolyl halides were efficiently difluoromethylated, thus providing medicinal chemists an alternative choice for the preparation of drug candidates with the difluoromethylated heteroarene unit
Possible Realization and Protection of Valley-Polarized Quantum Hall Effect in Mn/WS2
By using the first-principles calculations and model analyses, we found that
the combination of defected tungsten disulfide monolayer and sparse manganese
adsorption may give a KK` valley spin splitting up to 210 meV. This system also
has a tunable magnetic anisotropy energy, a clean band gap, and an appropriate
band alignment, with the Fermi level sitting right above the top of valence
bands at the K-valleys. Therefore, it can be used for the realization of the
valley-polarized anomalous Hall effect and for the exploration of other valley
related physics without using optical methods. A protective environment can be
formed by covering it with a hexagonal BN layer, without much disturbance to
the benign properties of Mn/WS2.Comment: 16 pages, 4 figure
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