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Even though, mechanistically, deuterium-labeling is expected at only one of the a carbons atoms, we obtained, approximately, an equal mixture of [D]4u and [D]4u′. This could be due to the scrambling of the deuterium between the a carbon atoms of the ketone catalyzed by CsF. Organoboronic acids acting as a proton source is proposed in literature; see: C. H. Oh, H. H. Jung, K. S. Kim, N. Kim, Angew. Chem. 2003, 115, 829;
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Even though, mechanistically, deuterium-labeling is expected at only one of the a carbons atoms, we obtained, approximately, an equal mixture of [D]4u and [D]4u′. This could be due to the scrambling of the deuterium between the a carbon atoms of the ketone catalyzed by CsF. Organoboronic acids acting as a proton source is proposed in literature; see: C. H. Oh, H. H. Jung, K. S. Kim, N. Kim, Angew. Chem. 2003, 115, 829;
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