Facile insertion of a cyclic alkyl(amino) carbene carbon into the B-B bond of diboron(4) reagents

We report herein the room temperature insertion of the carbene carbon atom of the cyclic (alkyl)(amino) carbene cAAC(Me) into the B-B single bonds of the diboron(4) compounds B(2)pin(2), B(2)cat(2), B(2)neop(2), and B(2)eg(2) (pin = pinacolato, cat = catecholato, neop = neopentyl-glycolato, eg = ethyleneglycolato).