名称:
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.