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13d seems unlikely.
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9a-d while the Lewis-basic DMF, DMSO, or HMPA could not be used as these would interfere with the catalyst coordination of the silicon. Protic solvents would decompose the reagent, so that they were also excluded.
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8d Hence, the configuration of 33a,b has not been rigorously proven but is likely to be as shown in Scheme 3, i.e., (R)-(+)-33a and (S)-(-)-33b.
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In some cases, where neither the absolute configuration nor the optical rotations were stated in the paper, the configuration could be deduced by comparison of the mobilities of our own samples on chiral HPLCcolumns with those that could be extracted from the relevant Supporting Information.
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