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The visible-light-accelerated oxo-azidation of vinyl arenes with trimethylsilylazide and molecular oxygen as stoichiometric oxidant was achieved. In contrast to photocatalysts based on iridium, ruthenium, or organic dyes, Cu(dap)2 Cl or Cu(dap)Cl2 were found to be unique for this transformation, which is attributed to their ability to interact with the substrates through ligand exchange and rebound mechanisms. CuII is proposed as the catalytically active species, which upon coordinating azide will undergo light-accelerated homolysis to form CuI and azide radicals. This activation principle (CuII -X→CuI +X. ) opens up new avenues for copper-based photocatalysis.
Hossain et al. (Wed,) studied this question.
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