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Herein we report an organophotocatalyzed one-pot approach for the synthesis of γ-undecalactone from 1-octanol and methyl acrylate using continuous-flow photoreactors. By using readily available and inexpensive 4CzIPN as the photocatalyst, the α-C-H alkylation reaction can be easily scaled up to 3 mol with a catalyst loading of 0.08%. [Display omitted] γ-Undecalactone has a powerful peach aroma and is widely used in the field of flavor and pharmaceutical industry. Herein we report an organophotocatalyzed one-pot approach for the synthesis of γ-undecalactone from 1-octanol and methyl acrylate using continuous-flow photoreactors. By using readily available and inexpensive 4CzIPN as the photocatalyst, the α -C-H alkylation reaction can be easily scaled up to 3 mol with a catalyst loading of 0.08 %. [ABSTRACT FROM AUTHOR]