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- W2019425478 abstract "Spontaneous assembly of amino acids into vapor-phase clusters occurs on heating the solid compounds in air. In comparison to the other amino acids, serine forms clusters to an unusual extent, showing a magic number octamer on sublimation; this octamer can be ionized and characterized by mass spectrometry. Two isomers of the vapor-phase serine octamer are generated, the minor one at 130 °C and the major at 220 °C. The higher temperature cluster shows a strong homochiral preference, as confirmed by isotopic labeling experiments. This serine cluster, like that generated earlier from solution in electrospray ionization experiments, undergoes gas-phase enantioselective substitution reactions with other amino acids. These reactions transfer the chirality of serine to the other amino acid through enantioselective incorporation into the octamer. Other serine pyrolysis products include alanine, glycine, ethanolamine, and small dipeptides, and many of these, too, are observed to be incorporated into the thermally formed serine octamers. Chiral chromatographic analysis confirmed that l-serine sublimation produced dl-alanine, glycine, and ethanolamine, while in the presence of hydrogen sulfide, l-serine yielded l-cysteine. The data demonstrate that sublimation of serine under relatively mild conditions yields chirally enriched serine octamers and that the chiral preference of the starting serine can be transferred to other compounds through cluster-forming chemical reactions." @default.
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- W2019425478 date "2006-12-01" @default.
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- W2019425478 title "Thermal Formation of Homochiral Serine Clusters and Implications for the Origin of Homochirality" @default.
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- W2019425478 doi "https://doi.org/10.1021/ja064617d" @default.
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