Journal
ORGANOMETALLICS
Volume 40, Issue 8, Pages 1015-1019Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.0c00807
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Funding
- National Natural Science Foundation of China [21632006]
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The BNB-embedded indenophenanthrenes 3 were synthesized by reducing LBX2 with potassium graphite under ambient conditions. The formation of 3 likely involves an aminoborylene intermediate and DFT calculations revealed a delocalized BNB 3c-2e interaction in the BNBC2 five-membered ring of 3. Treatment of 3a with IPr led to the coordination of IPr to one of two boron atoms, confirmed by X-ray single-crystal analysis.
The BNB-embedded indenophenanthrenes 3 have been synthesized by reduction of LBX2 (2; L represents a BN phenanthrene ligand and X = Br, Cl) with 2 equiv of potassium graphite under ambient conditions. The formation of 3 very likely goes through an aminoborylene intermediate, which underwent an intramolecular insertion into a C-C bond to close the polycyclic structure. DFT calculations disclosed the delocalized BNB 3c-2e interaction in the BNBC2 five-membered ring of 3. Treatment of 3a with IPr (1,3-diisopropyl-4,5-dimethylimi-dazol-2-ylidene) selectively led to the coordination of IPr to one of two boron atoms, the structure of which has been confirmed by an X-ray single-crystal analysis.
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