Borylated Dibenzoborepin; Synthesis by Skeletal Rearrangement and Photochromism Based on Bora-Nazarov Cyclization

摘要

The incorporation of boron atoms into π-conjugated skeletons has emerged as a useful strategy to produce new optoelectronic materials with unusual electronic structures. Indeed, many fascinating boron-containing π systems have been recently developed for various applications, such as organic light-emitting diodes, two-photon absorption materials, sensors, and photochromic systems.One key reason for the use of a tricoordinated boron atom from this point of view is its isosterism with a cationic tricoordinated carbon atom (Figure 1).