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Pattathil Narayanan, Vigneshkumar

University of British Columbia

A tricyclic 1,4,2-diazaborole was synthesized from a bidentate pyridylcarbene ligand and MesBBr₂, and its reduction afforded a novel aromatic boracycle. The nucleophilicity of boron in this species was confirmed via its alkylation with MeI, and a ’Frustrated Lewis Pair’ substrate activation with B(C₆F₅)₃, whereas the reaction with other boranes revealed unprecedented ring expansion reactions to form a diverse family of non-symmetrical 1,4,2,5- diazadiborenes. DFT calculation shed light on the electronic structure of the reduced 1,4,2-diazaborole derivative and provided insight into mechanistic aspects of the observed ring-expansion reactions. Using a tridentate polycyclic CNC pincer ligand, attempts were made to synthesize low-valent aluminium and boron complexes. Even though isolation of low-valent complexes were unsuccessful, the investigation provided many insights into new synthetic strategies that could potentially be tried in the future to isolate Al(I) and B(I) complexes. In addition to experimental studies, computational calculations were also performed to evaluate the stability of system and feasibility of further reactions.

Text

2024-07-15

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/86946

Chemistry

University of British Columbia

UBCO

http://creativecommons.org/licenses/by-nc-nd/4.0/