苯桥联交叉共轭 1,2,3-三硅环戊二烯
Phenylene-bridged cross-conjugated 1,2,3-trisilacyclopentadienes.
机构信息
Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66123, Saarbrücken, Germany.
出版信息
Chem Commun (Camb). 2018 Jul 24;54(60):8399-8402. doi: 10.1039/c8cc03297a.
1,2,3-Trisilacyclopentadienes are obtained from the reactions of cyclotrisilene c-Si3R4 (R = iPr3C6H2) with phenyl and diphenyl acetylene, respectively. With 1,4-diethynyl benzene the cross-conjugated bridging of two of the Si3C2 cycles by a para-phenylene linker is achieved. UV/vis spectroscopy indicates a small but significant effect of cross-conjugation, which is confirmed by TD-DFT calculations. The formation mechanism of the 1,2,3-trisilacyclopentadienes is elucidated by VT NMR.
1,2,3-三硅环戊二烯是通过环三硅烯 c-Si3R4（R = iPr3C6H2）与苯和二苯乙炔的反应分别得到的。用 1,4-二乙炔基苯实现了两个 Si3C2 环通过对亚苯基连接桥的交叉共轭。紫外可见光谱表明，交叉共轭有一个小但显著的影响，这一点通过 TD-DFT 计算得到了证实。通过 VT NMR 阐明了 1,2,3-三硅环戊二烯的形成机理。
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