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. 2016 May 16;6:25824. doi: 10.1038/srep25824

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(a) Deuterium labelling experiment; (1) GO promoted the formation of 2aD³ and 2aD⁶ (both in 16% yield). (2) Phl(OAc)₂ and DDQ promoted the formation of only 2a in 65% and 75% yield, respectively. (b) Proposed reaction mechanisms promoted by (1) GO, (2) Phl(OAc)₂ or DDQ. (c) H/D exchange experiment with D₂O. Only 1aD, 2aD³, and 2aD⁶ were observed in yields of 58%, 18%, and 18%, respectively.