Gallium tri-chloride derivatives of the sterically demanding pyridines 2,6-Ar2C6H3N (Ar=2,4,6-Me3C6H2 or 2,4,6-Pri3C6H2)
摘要:
The sterically demanding pyridines 2,6-Ar2C6H3N [Ar = 2,4,6-Me3C6H2 (1) or 2,4,6-(Pr3C6H2)-C-i (2)] were prepared by a palladium catalysed Kumada C-C coupling reaction in high yield. Pyridine I reacted with one equivalent of GaCl3 to afford the tetra-chloro gallate-pyridinium ion pair complex [GaCl4](-)[2,6-(2,4,6-Me3C6H2)(2)C6H3NH](+) (3). Contrastingly, pyridine 2 reacted with one equivalent of GaCl3 to afford the anticipated donor-acceptor complex [GaCl3{2,6-(2,4,6-(Pr3C6H2)-C-i)(2)C6H3N}] (4). Complexes 1-4 have been characterised variously by single crystal X-ray diffraction, NMR, CHN, and mass spectrometry. (C) 2009 Elsevier Ltd. All rights reserved.
Gallium tri-chloride derivatives of the sterically demanding pyridines 2,6-Ar2C6H3N (Ar=2,4,6-Me3C6H2 or 2,4,6-Pri3C6H2)
作者:Thomas Pell、David P. Mills、Alexander J. Blake、William Lewis、Stephen T. Liddle
DOI:10.1016/j.poly.2009.06.011
日期:2010.1
The sterically demanding pyridines 2,6-Ar2C6H3N [Ar = 2,4,6-Me3C6H2 (1) or 2,4,6-(Pr3C6H2)-C-i (2)] were prepared by a palladium catalysed Kumada C-C coupling reaction in high yield. Pyridine I reacted with one equivalent of GaCl3 to afford the tetra-chloro gallate-pyridinium ion pair complex [GaCl4](-)[2,6-(2,4,6-Me3C6H2)(2)C6H3NH](+) (3). Contrastingly, pyridine 2 reacted with one equivalent of GaCl3 to afford the anticipated donor-acceptor complex [GaCl32,6-(2,4,6-(Pr3C6H2)-C-i)(2)C6H3N}] (4). Complexes 1-4 have been characterised variously by single crystal X-ray diffraction, NMR, CHN, and mass spectrometry. (C) 2009 Elsevier Ltd. All rights reserved.
Directional Ionic Bonds
作者:Illia Hutskalov、Anthony Linden、Ilija Čorić
DOI:10.1021/jacs.3c01030
日期:——
Covalent and ionicbonds represent two fundamental forms of bonding between atoms. In contrast to bonds with significant covalent character, ionicbonds are of limited use for the spatial structuring of matter because of the lack of directionality of the electric field around simple ions. We describe a predictable directional orientation of ionicbonds that contain concave nonpolar shields around the