Boron-containing radical species

Reduction of a dihydroboryl cation to a boryl anion and its air-stable, neutral hydroboryl radical through hydrogen shuttling

“…Unlike in 5 and 5-thf, the B1-C1 and C1-N1 bonds at the neutral CAAC Me ligand (1.5174(18) and 1.4601(18)Å, respectively) are within the range typical of partial double bonds, as is typical for CAAC-stabilised boryl radicals due to the delocalisation of the unpaired electron over the N1-C1-B1 p framework. [5][6][7][8][9]21,22,[31][32][33] The IR spectrum of 6 shows a B-H stretching band at 2533 cm À1 (calc. : 2558 cm À1 at uB97XD/6-31+G*), ca.…”

“…I, Fig. 1a), [5][6][7][8][9][10] boryl radical cations ([(CAAC)LBY]c + , L ¼ Lewis donor) [10][11][12][13] and boryl anions ([(CAAC)BXY] À , e.g. II), [14][15][16][17] as well as boron(I) species such as borylenes ((CAAC)LBX, e.g.…”

Stable Radical Cation and Dication of an N‐Heterocyclic Carbene Stabilized Digallene: Synthesis, Characterization and Reactivity

“…Although the stabilization of radicals is quite challenging because of their high reactivity, significant progress has been achieved in the past decades by utilizing sterically encumbered and/or π ‐conjugated ligands . In terms of stable group 13 element‐based radicals, a variety of boron‐centered radicals have been isolated and structurally authenticated during the last few decades, including neutral, anionic, and cationic radicals . Contrastingly, the chemistry of heavier group 13 element‐based radicals is much less explored, and only anionic and neutral radicals have been isolated (Scheme ) .…”

Stable Boron Dithiolene Radicals

“…The reported neutral three‐coordinate L:BR 2 . species usually employ amines, phosphines, N‐heteroarenes, and carbenes as the Lewis base ligands (L:) . In addition, a neutral β‐diiminate‐based three‐coordinate diazaborocyclic radical (Figure a) has been reported, wherein the unpaired electron is delocalized over the six‐membered C 3 N 2 B ring .…”