1211417-77-4Relevant articles and documents
Monoborane NHC adducts in the coordination sphere of transition metals
Bissinger, Philipp,Braunschweig, Holger,Kupfer, Thomas,Radacki, Krzysztof
, p. 3987 - 3990 (2010)
Irradiation of various carbonyl complexes in the presence of 1,3-dimethylimidazol-2-ylideneborane (IMe·BH3) afforded the new borane complexes [CpMn(CO)2(η1-H 3B-IMe)] and [M(CO)5(η1-H3B-IMe] (M = Cr, Mo, W). With the exception of [Mo(CO)5(η1- H3B-IMe], which was detected only in solution, the solid-state structures of all species were validated by single-crystal X-ray diffraction. The NHC-BH3 moiety was found to be coordinated to the metal center through a B-H-M three-center two-electron bond presumably without any B-M interaction. μ-Back-donation from the metal center to the boron-containing ligand is most likely negligible.
Visible-Light-Induced Radical Defluoroborylation of Trifluoromethyl Alkenes: An Access to gem-Difluoroallylboranes
Chen, Guojun,Wang, Liling,Liu, Xiaozu,Liu, Peijun
, p. 2990 - 2996 (2020)
A photoredox-catalyzed defluoroborylation of trifluoromethyl alkenes with N-heterocyclic carbene boranes is described for the synthesis of gem-difluoroallylboranes. This protocol exhibits a broad substrate scope and good functional group compatibility, which enables the late-stage functionalization of structurally complex compounds. Further transformations of the defluoroborylation products to valuable CF2-containing molecules are also demonstrated. (Figure presented.).
Insight into the Decomposition Mechanism of Donor-Acceptor Complexes of EH2(E = Ge and Sn) and Access to Germanium Thin Films from Solution
Brown, Alex,Dai, Guoliang,Ferguson, Michael J.,Mcdonald, Robert,Rivard, Eric,Sinclair, Jocelyn
, (2020)
Electron-donating N-heterocyclic carbenes (Lewis bases, LB) and electron-accepting Lewis acids (LA) have been used in tandem to yield donor-acceptor complexes of inorganic tetrelenes LB·EH2·LA (E = Si, Ge, and Sn). Herein, we introduce the new germanium (II) dihydride adducts ImMe2·GeH2·BH3 (ImMe2 = (HCNMe)2C:) and ImiPr2Me2·GeH2·BH3 (ImiPr2Me2 = (MeCNiPr)2C:), with the former complex containing nearly 40 wt % germanium. The thermal release of bulk germanium from ImMe2·GeH2·BH3 (and its deuterated isotopologue ImMe2·GeD2·BD3) was examined in solution, and a combined kinetic and computational investigation was undertaken to probe the mechanism by which Ge is liberated. Moreover, the thermolysis of ImMe2·GeH2·BH3 in solution cleanly affords conformal nanodimensional layers of germanium as thin films of variable thicknesses (20-70 nm) on silicon wafers. We also conducted a computational investigation into potential decomposition pathways for the germanium(II)- and tin(II)-dihydride complexes NHC·EH2·BH3 (NHC = [(HCNR)2C:]; R = 2,6-iPr2C6H3 (Dipp), Me, and H; and E = Ge and Sn). Overall, this study introduces a mild and convenient solution-only protocol for the deposition of thin films of Ge, a widely used semiconductor in materials research and industry.
Photoinduced Single-Electron Transfer as an Enabling Principle in the Radical Borylation of Alkenes with NHC–Borane
Chen, Xiao-Qing,Hu, Yuan-Zhuo,Song, Dan,Xia, Peng-Ju,Xiang, Hao-Yue,Xiao, Jun-An,Yang, Hua,Ye, Zhi-Peng
, p. 6706 - 6710 (2020)
A photoinduced SET process enables the direct B?H bond activation of NHC–boranes. In contrast to common hydrogen atom transfer (HAT) strategies, this photoinduced reaction simply takes advantage of the beneficial redox potentials of NHC–boranes, thus obviating the need for extra radical initiators. The resulting NHC–boryl radical was used for the borylation of a wide range of α-trifluoromethylalkenes and alkenes with diverse electronic and structural features, providing facile access to highly functionalized borylated molecules. Labeling and photoquenching experiments provide insight into the mechanism of this photoinduced SET pathway.
Photocatalytic C-F Bond Borylation of Polyfluoroarenes with NHC-boranes
Chen, Kai,Chen, Xiao-Qing,Hu, Yuan-Zhuo,Xia, Peng-Ju,Xiang, Hao-Yue,Xiao, Jun-An,Yang, Hua,Ye, Zhi-Peng
supporting information, p. 1742 - 1747 (2020/03/24)
The first photoredox-catalyzed defluoroborylation of polyfluoroarenes with NHC-BH3 has been facilely achieved at room temperature via a single-electron-transfer (SET)/radical addition pathway. This new strategy makes full use of the advantage of photoredox catalysis to generate the key boryl radical via direct activation of a B-H bond. Good functional group tolerance and high regioselectivity offer this protocol incomparable advantages in preparing a wide array of valuable polyfluoroarylboron compounds. Moreover, both computational and experimental studies were performed to illustrate the reaction mechanism.
