Sulphur dioxide in deuterium oxide catalyses the regioselective exchange of the hydrogen atoms α to the triple bond in terminal alkynes for deuterium in the presence of their functionality.
C. Chang, K. G. Cronin, D. D. Crotts, E. Duñach, T. R. Gadek and K. P. C. Vollharadt, J. Chem. Soc., Chem. Commun., 1984, 1545 DOI: 10.1039/C39840001545
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