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26
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29544445694
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note
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The relative configuration of 2 a was determined by X-ray crystallographic analysis of a 2,4-DNP (DNP = dinitrophenylhydrazine derivative of (±)-2a; the absolute configurations of the stereogenic centers C2 and C3 were determined by comparison of optical rotation data of the reductive dephenylseleno product of (+)-2a with those of the reductive debromo product of a known compound (see Supporting Information for details).
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