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We leverage the slow liberation of nitrogen dioxide from a newly discovered, inexpensive succinimide‐derived reagent to allow for the C−H diversification of alkenes and alkynes. Beyond furnishing a library of aryl β‐nitroalkenes, this reagent provides unparalleled access to β‐nitrohydrins and β‐nitroethers. Detailed mechanistic studies strongly suggest that a mesolytic N−N bond fragmentation liberates a nitryl radical. Using in situ photo‐sensitized, electron paramagnetic resonance spectroscopy, we observed direct evidence of a nitryl radical in solution by nitrone spin‐trapping. To further exhibit versatility of N‐nitrosuccinimide under photoredox conditions, the late‐stage diversification of an extensive number of C−H partners to prepare isoxazolines and isoxazoles is presented. This approach allows for the formation of an in situ nitrile oxide from a ketone partner, the presence of which is detected by the formation of the corresponding furoxan when conducted in the absence of a dipolarophile. This 1,3‐dipolar cycloaddition with nitrile oxides and alkenes or alkynes proceeds in a single‐operational step using a mild, regioselective, and general protocol with broad chemoselectivity. [ABSTRACT FROM AUTHOR]

Keywords: alkenes; C-H nitration; photoredox; radicals; reaction mechanisms Furthermore, using in situ photo-sensitized, electron paramagnetic resonance spectroscopy, clear evidence for a nitryl radical in solution by nitrone spin-trapping was obtained. Alkenes, C-H nitration, photoredox, radicals, reaction mechanisms. [Extracted from the article]