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The trilithium compound 1,3-[PhMe2Si-C(Li)═C(H)]2C6H3Li (2b) reacted with BCl3, AlCl3, or GaCl3 by salt elimination to yield dinuclear heptacyclic compounds (4). Two tridentate tricarbanionic ligands coordinate two B, Al, or Ga… Click to show full abstract
The trilithium compound 1,3-[PhMe2Si-C(Li)═C(H)]2C6H3Li (2b) reacted with BCl3, AlCl3, or GaCl3 by salt elimination to yield dinuclear heptacyclic compounds (4). Two tridentate tricarbanionic ligands coordinate two B, Al, or Ga atoms and adopt a helical arrangement of the ligands around a central E2 unit. The unusual structures comprise E2C2 heterocycles with two 3c-2e (three-center-two-electron) E-C-E bonds and two C atoms of aromatic rings in the bridging positions. While such a bonding situation is well-documented in Al chemistry, it is rare for B and Ga compounds. Insight into the bonding situation of the molecules is provided by DFT calculations.
Journal Title: Inorganic chemistry
Year Published: 2020
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