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- W2011756688 abstract "The circular dichroism spectra of a number of N-acetylneuraminic acid derivatives in aqueous solution were studied. For all compounds, the Cotton effects were found to be in the spectral range of the acetamido and carboxyl chromophores. The c.d. curves of the methy, ethyl, and allyl alpha-D-ketosides are characterized by a broad, positive band centered at lambda similar to 195 nm with a slight skew towards the higher wavelengths and weak bands between lambda 225 and 255 nm, whereas the methyl beta-D-ketoside and the corresponding methyl ester show only an intense positive band with a broad shoulder in the same spectral range. 5-Acetamido-3,5-dideoxy-D-glycero-beta-D-galacto-nonulopyranose, its methyl beta-D-ketoside, and 5-acetamido-3,5-dideoxy-D-glycero-D-galacto-nonulopyranosonamide containing only the acetamido chromophore showed one single positive Cotton effect centered at lambda similar to 192 nm. The c.d. spectrum of 5-acetamido-3,5-dideoxy-D-glycero-D-galacto-nonulopyranosonic acid confirms the beta-D configuration of the free acid in aqueous solution, whereas the shape of the c.d. curve of O-(N-acetyl-alpha-D-neuraminopyranosyl)-(2yields3)-O-beta-D-galactopyranosyl-(1 yields 4)-D-glucopyranose resembles that of the methyl, ethyl, and allyl alpha-D-ketosides 2-4." @default.
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- W2011756688 date "1975-04-01" @default.
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- W2011756688 title "Circular dichroism studies on α- and β-ketosides of 5-acetamido-3,5-dideoxy-D-glycero-D-galacto-nonulopyranosonic acid (N-acetylneuraminic acid) and of some of its derivatives" @default.
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- W2011756688 doi "https://doi.org/10.1016/s0008-6215(00)82607-5" @default.
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