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That the (4-nitrobenzyl)pyridiniums also undergo homolytic cleavage is not suprising, because of all possible carbenium ions that can be produced, only the (4-nitrobenzyl)carbenium will not be stabilized by resonance, while the 4-nitrobenzyl radical would be.
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Reference 48 has an extensive review of studies on the substitution reactions of benzyl derivatives
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