An Efficient Borafluorene for the Construction of Extended π-Conjugated Systems

Fukushima, Shoji and coworkers reported that 9-chloro-9-borafluorene mediates sequential alkyne insertion (1,2-carboboration) and oxidative deborylation/Csp²–Csp² coupling reactions, affording extended π-conjugated molecules. The sequential reactions can be performed in a one-pot fashion and are very useful for the construction of a wide variety of π"-conjugated systems, which are potentially applicable to organic electronics.