Benzyl Radical -

: Due to the low bond dissociation energy, benzylic positions are highly reactive toward free-radical substitutions, such as bromination using N-bromosuccinimide (NBS) .

: Because the resulting radical is so stable, the benzylic C–HC–H bond is unusually weak (approx. ) compared to standard primary ( ) or even tertiary ( C–HC–H benzyl radical

The most prominent feature of the ( ) is its exceptional resonance stability . Unlike simple alkyl radicals, the unpaired electron on the benzylic carbon is delocalized over the entire : Due to the low bond dissociation energy,

-system of the benzene ring, making it significantly more stable and easier to form. Key Features of the Benzyl Radical Unlike simple alkyl radicals, the unpaired electron on

: In organic synthesis, the stability of the benzyl radical is leveraged for site-specific functionalization, such as installing leaving groups or enabling complex cyclization cascades in natural product synthesis. Comparative Stability

: The radical can be represented by five resonance structures. The unpaired electron moves from the benzylic carbon to the ortho and para positions of the aromatic ring, effectively distributing the radical character across multiple atoms.