Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 27, Pages 8084-8088Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201803180
Keywords
aromaticity; boron; borylation; phenalenyl; polycyclic aromatic hydrocarbons
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Funding
- European Research Council under framework 7 [305868]
- Horizon 2020 Research and Innovation Program [769599]
- Leverhulme Trust [RPG-2014-340]
- University of Manchester
- Royal Society
- EPSRC [EP/K039547/1]
- EPSRC [EP/K039547/1] Funding Source: UKRI
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1-Boraphenalenes have been synthesized by reaction of BBr3 with 1-(aryl-ethynyl)naphthalenes, 1-ethynylnaphthalene, and 1-(pent-1-yn-1-yl)naphthalene and they can be selectively functionalized at boron or carbon to form bench-stable products. All of these 1-boraphenalenes have LUMOs localized on the planar C12B core that are closely comparable in character to isoelectronic phenalenyl cations. In contrast to the comparable LUMOs, the aromatic stabilization of the C5B ring in 1-boraphenalenes is dramatically lower than the C-6 rings in phenalenyl cations. This is due to the occupied orbitals of symmetry being less delocalised in the 1-boraphenalenes.
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