Various α-halogeno ketones undergo reductive dehalogenation to the corresponding ketones almost quantitatively with sodium dithionite using viologen as an electron-transfer catalyst in organic solvent–water two-phase systems.
K. K. Park, C. W. Lee, S. Oh and J. W. Park, J. Chem. Soc., Perkin Trans. 1, 1990, 2356 DOI: 10.1039/P19900002356
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