Five derivatives of methyl 3,4,6-triacetyl-2-deoxy-(3@-dialkylureido)-b-D-glucopyranoside were studied by 1H and 13C, NMR spectroscopy in solutions and by 13C NMR spectroscopy in the solid state. Sterically CDCl 3 crowded substituents such as n-hexyl and cylcohexyl change the chemical shifts of H-1,
Evidence of acetyl migration during the methylation of methyl 2,3,4-tri-O-acetyl-d-mannose with diazomethaneboron trifluoride etherate
β Scribed by Sukumar Manna; Bill H. McAnalley
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 278 KB
- Volume
- 222
- Category
- Article
- ISSN
- 0008-6215
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π SIMILAR VOLUMES
Reductive cleavage of fully methylated, partially O-carboxymethylated cellulose had previously been shown to produce 4-O-acetyl-1,5-anhydro-2,3,6-tri-O-methyl-, -2-O-(methoxycarbonylmethyl)-3,6-di-O-methyl-, -3-O-(methoxycarbonylmethyl)-2,6-di-O-methyl-, -6-O-(methoxycarbonylmethyl)-2,3-di-O-methyl-
Acylated ]3-o-xylopyranose derivatives are known to exist as a mixture of the 1C 4 and 4C I conformers in rapid equilibrium in solution [3]. Several conformations have also been reported for/3-D-xylopyranose derivatives in the solid state [4]. In the course of our study to investigate the functions