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Proton nmr and carbon 13 nmr studies on methylmethyl d galactosiduronates and their per o acetyl derivatives



Proton nmr and carbon 13 nmr studies on methylmethyl d galactosiduronates and their per o acetyl derivatives



Carbohydrate Research 97(1): 11-18



The 1H- and 13C-NMR spectra of the anomeric methyl (methyl D-galactosid)-uronates [Klebsiella capoular components] and the 1H-NMR spectra of their acetyl derivatives were analyzed. The spectra of the unacetylated D-galactopyranosiduronates showed good correlation with those of the corresponding anomeric D-galactopyranuronic acids and their methyl esters, and with those of the anomeric methyl D-galactopyranosides. From the values of the chemical shifts and coupling constants, it was concluded that the anomeric methyl (methyl D-galatopyranosid)uronates and their corresponding peracetates are in the 4C1(D) conformation. The chemical shifts in the 13C-NMR spectra show good correlation with those of the methyl D-galactosides. The signals of the furanose derivatives appear at fields lower than those of the corresponding pyranose compounds.

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