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Proposed reaction scheme, including ethylene and ethanol, was extracted from the present experimental Raman data, our DFT data and additional mechanistic insights reflected in refs. 16 , 21 , 51 , 63 . The main C 2+ products are highlighted in green. Reaction steps confirmed by experimental studies are reported as solid lines, and proposed steps are labelled as dashed lines. Grey arrows indicate potential COCH x coupling routes. H atoms are given in white, O atoms in red and C atoms in black.

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