Arabinose 3,4-di-O-methyl

In agreement with the earlier findings,126 approximately equimolecular proportions of 2,3,4,6-tetra-, 2,3,4-tri-, and 2,4-di-O-methyl-D-galacto-pyranose were isolated as the main products of hydrolysis of methylated e-galactan, but, in addition, small proportions of 2,3,4-tri-O-methyl-L-arabinose, 2,5-di-O-methyl-L-arabinose, and 2,4,6-tri- and 2-mono-0-methyl-D-galactose were found. Evidence in favor of partial structure XLI for the galactan framework was obtained by application to the polysac-... 

A series of polysaccharides have been isolated from the sea grass, Phyllos-padix torreyi, which are unusual in containing residues of o-apiose (2—28 One of these polysaccharides had the composition, L-rhamnose, L-arabinose, D-xylose, D-apiose, D-galactose, and D-mannuronic acid in the molar ratio 4 1 5 2 4 9. Of the D-apiose residues 80 % were oxidized by periodate and the major neutral sugar residues found in the hydrolysate of the methylated polysaccharide were 2,3,5-tri-O-methyl-L-arabinose, 2,5-di-O-methyl-L-arabinose, 3,4-di-O-methyl-L-rhamnose, 2,3-di-O-methyl-D-xylose, 2,3,6-tri-0-methyl-D-galactose, and 2,4-di-O-methyl-D-galactose in the ratio 1 1 6 6 3 3. 

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See also in sourсe #XX -- [ , , ]

See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

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