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Synthesis and carbon 13 nmr spectra of mono methyl ethers and di methyl ethers of methyl alpha d galacto pyranoside



Synthesis and carbon 13 nmr spectra of mono methyl ethers and di methyl ethers of methyl alpha d galacto pyranoside



Bioorganicheskaya Khimiya 4(11): 1489-1494



13C-NMR spectra of mono- and dimethyl ethers of methyl .alpha.-D-galactopyranoside were obtained and interpreted. The negative .beta.-effects for the signals of the neighboring C atoms were observed upon methylation of equatorial OH group. The value of .beta.-effect depends on the spatial orientation of the substituent at the .beta.-C. If the axial OH group is methylated the .beta.-effects are positive. These results are of value for interpretation of 13C-NMR spectra of oligo- and polysaccharides.

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