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After 1982, they were made with only 2.5% copper and coated with zinc, so there are not as many copper molecules exposed to do this reaction. The most famous example of this chemical reaction is ...

More information: Honggang Zhang et al, Site- and enantioselective allylic and propargylic C–H oxidation enabled by copper-based biomimetic catalysis, Nature Catalysis (2025). DOI: 10.1038 ...