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      An amidinate-stabilized Germatrisilacyclobutadiene Ylide

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      Author
      Yeong, Hui-Xian
      Zhang, Shu-Hua
      Xi, Hong Wei
      Guo, Jing-Dong
      Lim, Kok Hwa
      Nagase, Shigeru
      So, Cheuk-Wai
      Date of Issue
      2012
      School
      School of Chemical and Biomedical Engineering
      School of Physical and Mathematical Sciences
      Abstract
      The synthesis and characterization of new amidinate-stabilized germatrisilacyclobutadiene ylides [L3Si3GeL′] (L=PhC(NtBu)2; L′=ËL; Ë=Ge (3), Si (7)) are described. Compound 3 was prepared by the reaction of [LSi[BOND]SiL] (1) with one equivalent of [LGe[BOND]GeL] (2) in THF. Compound 7 was synthesized by the reaction of 2 with excess 1 in THF. The bisamidinate germylene [L2Ge:] (4) is a by-product in both reactions. Moreover, compound 7 was prepared by the reaction of 3 with one equivalent of 1 in THF. Compounds 3 and 7 have been characterized by NMR spectroscopy, X-ray crystallography, and theoretical studies. The results show that compounds 3 and 7 are not antiaromatic. The puckered Si3Ge four-membered rings in 3 and 7 have a ylide structure, which is stabilized by amidinate ligands and the electron delocalization within the Si3Ge four-membered ring.
      Type
      Journal Article
      Series/Journal Title
      Chemistry - a European journal
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      • SPMS Journal Articles
      http://dx.doi.org/10.1002/chem.201102201
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