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85030194965
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note
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Although the X-ray structural analysis confirmed the relative stereochemistry assigned by NMR spectroscopy, it also indicated that 3n was racemic, an entirely unexpected result given the non-zero optical rotation of the bulk sample. HPLC analysis indeed confirmed the racemic nature of the crystalline sample of 3n, but HPLC examination of the mother liquor demonstrated >99% optical purity. It was therefore concluded that the racemic crystals were formed by preferential crystallisation of the major enantiomer with the small amount of opposite enantiomer present, which arose from the starting (S)-pyroglutamic acid which was of 97% e.e.
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