posted on 2017-01-19, 00:00authored byHolger Braunschweig, Ivo Krummenacher, Marc-André Légaré, Alexander Matler, Krzysztof Radacki, Qing Ye
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 [(PMe3) (CO)3Fe=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.