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Herein, we present a proof of concept for the photoredox oxidation of unsaturated fatty acids using \u03b8\u2010metallacarborane complexes Na[Co(1,2\u2010C\n                    <jats:sub>2<\/jats:sub>\n                    B\n                    <jats:sub>9<\/jats:sub>\n                    H\n                    <jats:sub>11<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    ] (\n                    <jats:bold>[Na]1<\/jats:bold>\n                    ) and Na[Fe(1,2\u2010C\n                    <jats:sub>2<\/jats:sub>\n                    B\n                    <jats:sub>9<\/jats:sub>\n                    H\n                    <jats:sub>11<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    ] (\n                    <jats:bold>[Na]2<\/jats:bold>\n                    ) as water\u2010soluble, earth\u2010abundant photoredox catalysts. Commercial sunflower oil and pork lard served as convenient model systems mimicking waste lipid streams, while targeting future application to postconsumer used cooking oils. Under UVA irradiation in aqueous media, these complexes convert oleic\u2010 and linoleic\u2010acid derivatives into epoxides, vicinal diols and shorter\u2010chain oxygenated acids, with reaction selectivity finely tuned by pH, irradiation time and oxidant. Notably,\n                    <jats:bold>[Na]1<\/jats:bold>\n                    exhibits superior oxidative power and acts as a \u201cmolecular scissor,\u201d promoting C\u2500C bond cleavage of vicinal diols and enabling the formation of mono\u2010 and dicarboxylic acids such as pelargonic and azelaic acids, valuable nonpetroleum\u2010based building blocks. Sodium persulfate affords high conversions with controlled over\u2010oxidation, while O\n                    <jats:sub>2<\/jats:sub>\n                    enhances diol selectivity. \u03b8\u2010Metallacarboranes thus emerge as a sustainable platform for upgrading waste lipid streams into value\u2010added chemicals in water, advancing circular economy goals without competing with food supply chains.\n                  <\/jats:p>","DOI":"10.1002\/cssc.71113","type":"journal-article","created":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T10:45:10Z","timestamp":1791629110000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["\u03b8\u2010Metallacarboranes as Sustainable Photoredox Oxidation Catalysts of Unsaturated Fatty Acids From Oil and Pork 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