A B-B Bond-Containing Polycyclic π-Electron System: Dithieno-1,2-dihydro-1,2-diborin and Its Dianion

摘要

Boracycles have gained continuous attention not only from a fundamental viewpoint but also as potential materials for various applications, such as optoelectronics and sensors. Of particular interest is the fact that the incorporation of an electron-deficient boron atom having a vacant p orbital into a π-conjugated cyclic skeleton enables us to produce a π-electron system isoelectronic to its cationic carbon analogue. For instance, borole, a boracyclo-pentadiene, is isoelectronic to a cyclopentadienyl cation and thus has four-π-electron antiaromatic character.