PubAg

Main content area

An Isolable Bismabenzene: Synthesis, Structure, and Reactivity

Author:
Ishii, Takuya, Suzuki, Katsunori, Nakamura, Taichi, Yamashita, Makoto
Source:
Journal of the American Chemical Society 2016 v.138 no.39 pp. 12787-12790
ISSN:
1520-5126
Subject:
X-ray diffraction, alkynes, benzene, chemical bonding, energy, nuclear magnetic resonance spectroscopy, ultraviolet-visible spectroscopy
Abstract:
A stable bismabenzene was synthesized, isolated, and structurally characterized. The prospective aromaticity of this heavy benzene, bearing a sixth-row element, was examined by X-ray crystallography and NMR and UV–vis spectroscopy, as well as theoretical DFT calculations. Structural analysis of this bismabenzene revealed a planar ring containing unsaturated Bi–C and C–C bonds. As bond alternations could not be observed, these results are consistent with the formal criteria of aromaticity. Theoretical calculations also support the aromatic nature of this bismabenzene, which reacted with an alkyne to form the corresponding [4+2] cycloadduct, thus demonstrating a small yet tangible aromatic stabilization energy.
Agid:
5560563