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The carbon monoxide adduct of an unhindered and highly reactive CAAC-bound arylborylene, (CAAC)B(CO)Ar (CAAC = cyclic (alkyl) (amino)carbene), has been prepared using a transfer reaction from the linear iron borylene complex (PMe 3 ) (CO) 3 Fe=BAr. (CAAC)B(CO)Ar is a source of the dicoordinate (CAAC)ArB: borylene that can be liberated by selective photolytic CO extrusion and that, although highly reactive, is sufficiently long-lived to react intermolecularly. Through trapping of the borylene generated in this manner, we present, among others, the first metal-free borylene(I) species containing a nitrogen-based donor, as well as a new boron-containing radical.
Braunschweig et al. (Fri,) studied this question.