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   https://doi.org/10.1063/5.0239152  

   Gorsak, Cameron A; Bowman, Henry J; Gann, Katie R; Buontempo, Joshua T; Smith, Kathleen T; Tripathi, Pushpanshu; Steele, Jacob; Jena, Debdeep; Schlom, Darrell G; Xing, Huili Grace; et al (December 2024, Applied Physics Letters)

   In this study, we investigate in situ etching of β-Ga2O3 in a metalorganic chemical vapor deposition system using tert-butyl chloride (TBCl). We report etching of both heteroepitaxial 2¯01-oriented and homoepitaxial (010)-oriented β-Ga2O3 films over a wide range of substrate temperatures, TBCl molar flows, and reactor pressures. We infer that the likely etchant is HCl (g), formed by the pyrolysis of TBCl in the hydrodynamic boundary layer above the substrate. The temperature dependence of the etch rate reveals two distinct regimes characterized by markedly different apparent activation energies. The extracted apparent activation energies suggest that at temperatures below ∼800 °C, the etch rate is likely limited by desorption of etch products. The relative etch rates of heteroepitaxial 2¯01 and homoepitaxial (010) β-Ga2O3 were observed to scale by the ratio of the surface energies, indicating an anisotropic etch. Relatively smooth post-etch surface morphology was achieved by tuning the etching parameters for (010) homoepitaxial films. 

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2. Preference of cis -Thioamide Structure in N -Thioacyl- N -methylanilines

   https://doi.org/10.1021/acs.orglett.0c03512  

   Zhang, Jin; Liu, Zhulin; Yin, Zheng; Yang, Xiufang; Ma, Yangmin; Szostak, Roman; Szostak, Michal (December 2020, Organic Letters)

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3. Rapid Aminations of Functionalized Aryl Fluorosulfates in Water

   https://doi.org/10.1002/anie.202411295  

   Iyer, Karthik S; Dismuke_Rodriguez, Kylee B; Lammert, Robert M; Yirak, Jordan R; Saunders, John M; Kavthe, Rahul D; Aue, Donald H; Lipshutz, Bruce H (September 2024, Angewandte Chemie International Edition)

   Abstract Aryl fluorosulfates of varying complexities have been used in amination reactions in water using a new Pd oxidative addition complex (OAC‐1) developed specifically to match the needs of the fine chemicals industry, not only in terms of functional group tolerance, but also reflecting time considerations associated with these important C−N couplings. Also especially noteworthy is that they replace both PFAS‐related triflates and nonaflates, which are today out of favor due to recent government regulations. The new complex based on the BippyPhos ligand is used at low loadings and under aqueous micellar conditions. Moreover, it is easily prepared and stable to long term storage. DFT calculations on the OAC precatalyst compare well with the X‐ray structure of the crystals with π‐complexation to the aromatic system of the ligand and also confirm the NMR data showing a mixture of conformers in solution that differ from the X‐ray structure in rotation of the phenyl andt‐butyl ligand substituents. An extensive variety of coupling partners, including pharmaceutically relevant APIs, readily participate under mild and environmentally responsible reaction conditions. 

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   Zhang, Linda; Clement, Wendy L. (October 2021, International Journal of Plant Sciences)

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