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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Visible light can help chemists generate nitrogen-centered radicals—reactive intermediates that offer an alternative route to carbon–nitrogen bonds and nitrogen-containing rings. Their reactivity depends on their structure, so light is not a universal switch: the precursor, catalyst and reaction design determine what the radical does.
Why are carbon–nitrogen bonds challenging to make?
Carbon–nitrogen bonds are common in bioactive molecules, including drugs, but assembling them can require careful control over how the nitrogen atom reacts. A conventional strategy uses nitrogen nucleophiles: nitrogen-rich reagents donate an electron pair to a carbon atom. That approach is useful, but it can constrain which starting materials and reaction pathways are practical.
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Daniele Leonori, a chemist at the University of Manchester, has explored nitrogen-centered radical chemistry as another way to form these bonds. A radical has an unpaired electron; when that electron is centered on nitrogen, the intermediate can participate in bond-forming steps that differ from those of a conventional nucleophile. Jennifer Newton’s 2021 Chemistry World feature introduces this research direction. The broad examples below describe the wider field and should not be taken as specific reactions from that interview.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsHow does light generate nitrogen-centered radicals?
In visible-light photoredox catalysis, a light-absorbing catalyst can transfer a single electron or energy to a reaction partner. That activation can produce a nitrogen-centered radical under comparatively mild conditions. Depending on the reaction, it may avoid the need for stoichiometric activation reagents or toxic radical initiators; those advantages are not automatic and vary with the chemistry.
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Nitrogen radicals do not all behave alike. Their hybridization and substituents influence whether they act more like electrophiles or nucleophiles, and therefore which reaction partners they engage with. The review “When Light Meets Nitrogen-Centered Radicals: From Reagents to Catalysts,” in Accounts of Chemical Research, describes them as “a versatile class of highly reactive species that have a longer history than the classical carbon-based radicals in synthetic chemistry.”
What kinds of structures can this chemistry build?
Ring formation from nitrogen radicals
Visible-light activation of N–H bonds in compounds such as hydrazones, benzamides and sulfonamides can generate nitrogen-centered radicals. These intermediates may cyclize—forming a new bond within the same molecule—to build nitrogen heterocycles, which are ring-shaped structures containing nitrogen. Reported pathways include 5-exo and 6-endo cyclizations, as well as cascade reactions in which one transformation leads into another.
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Ring opening from oxime esters
Light-driven formation of iminyl radicals from oxime esters can trigger cleavage of a carbon–carbon bond in a ring. This ring opening produces a cyanoalkyl radical, which can then take part in further bond-forming reactions. It is an example of using radical reactivity not only to make a bond, but also to reorganize a molecular framework.
Radicals as temporary catalysts
In some strategies, a nitrogen-centered radical acts as a covalent catalyst: it temporarily engages another molecule and helps activate it for a subsequent reaction. The review describes applications involving allyl sulfones, vinylcyclopropanes and N-tosyl vinylaziridines, including alkene difunctionalization and late-stage modification of complex molecules. These are examples of the broader research area, not a list of reactions attributed to Leonori’s interview.
Strain-release amination
A separate primary study reports photocatalytic nitrogen-radical amination of [1.1.1]propellane. The reaction releases strain in this compact molecule while making functionalized bicyclo[1.1.1]pentylamines, structures described by the authors as potential building blocks for medicinal-chemistry programs. This is a distinct example from the field; the study does not establish that it was the work featured in the 2021 profile.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does the radical approach differ from a nucleophilic one?
The distinction is in the reactive intermediate and the path to the bond, not in a claim that one method is always better. A nucleophilic approach relies on an electron-pair donor attacking a carbon center. A radical approach creates a nitrogen species with an unpaired electron, then uses its particular reactivity to form bonds or initiate a sequence such as cyclization or ring opening.
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For a given radical method, chemists must consider the precursor and how it is activated, the radical’s polarity and structure, and the bond-forming outcome the reaction is designed to achieve. Light can make some of these transformations possible under mild conditions, but the best route depends on the target molecule and the reaction’s specific requirements.
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The value of nitrogen-radical chemistry is its range of possible reaction paths: it can build nitrogen-containing rings, open strained or cyclic structures, and help modify complex molecules. Photoredox methods provide one way to access these intermediates, while the radical’s structure determines how it reacts. Together, those features give synthetic chemists additional strategies for assembling molecular frameworks relevant to bioactive compounds.
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