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The corresponding N-phosphinoyl protected α-amido sulfone did not react under the PTC conditions employed. The enantiomeric purities were determined by HPLC.
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Transformation of 14x into the corresponding knownγ- aminoα,β-unsaturated acid 15 allowed the determination of the absolute configuration (see Supporting Information). The enantiomeric purity was determined by HPLC.
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Forming bond C-C distances, TSI: 2.18Å; TSII: 2.33Å; TSIII: 2.39Å.
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For X-Ray evidence of a H-bond network in a tetrabutyl ammonium cation, see
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