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Cyclopropenes are generated through visible light photosensitization of alkenyldiazo compounds, suggesting new pathways for synthesis.
Vinyldiazo compounds are interesting precursors for generating vinylcarbenoid intermediates, but their direct photochemical activation can result in competitive formation of 1H-pyrazoles via 1,5-electrocyclization and cyclopropenes via singlet carbene-mediated 2π-electrocyclization. Herein,...
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Li et al. (2026) studied this question.
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