1,4-P-D-Mannopyranose

Fig. 9. Partial structural formulas and shorthand notations for principal hemiceUuloses found in wood, where the sugar units ate noted as P-D-xylopyranose (Xylp), 4-Omethyl-a-D-glucopyranosyluronic acid (GlupU), a-L-arabinofuranose (Araf), P-D-glucopyranose (Glup), P-D-mannopyranose (Manp), and P-D-galactopyranose (Galp) for (a) arabino-4-O-methylglucuronoxylan from softwood, (b) 0-acetyl-galactoglucomannan from softwood, and...

The specific optical rotations of pure a- and p-D-mannopyranose are -1-29.3° and -17.0°, respectively. When either form is dissolved in water, mutarotation occurs, and the observed rotation of the solution changes until a final rotation of -1-14.2° is observed. Assuming that only a- and p-pyranose forms are present, calculate the percent of each isomer at equilibrium. 

I4l6-Tii-0-benzoyl-[(S)-1,2-0-chloro(methoxy)methylene]-p-D-mannopyranose... 

Anhydro-p-D-mannopyranose 8,70,90,140,262,278) Aus Amylose kann pyrolytisch ein Pyrodextrin erhalten werden partielle saure Hydrolyse fiihrt zu einer Reihe von Disacchariden, neben denen auch Laevoglucosan gefunden wurde 22,249,254)... 

Also, psudo-P-D-mannopyranose (115) has been synthesized from 99 by the following reactions [28], Halogenation of 99 with triphenylphosphine, imidazole and iodine gave 1 L-4-0-benzyl-3-deoxy-3-iodo-1,2 5,6-di-0-isopropylidene-a//o-inositol (106), m.p. 77.4 °C, [oc]p° —30.1° (chloroform). Treatment of 106 with lithium aluminium hydride-resulted in a formation of two endocyclic olefins (107) and (108) in an approximately 1 2 ratio. Oxidation of 108with dimethyl sulfoxide and oxalyl chloride gave the enone (109) as a syrup, [a] 0 —68.11° (chloroform). Stereoselective... 

Trumbo, D L, Schuerch, C, Steric control in the polymerization of l,2-anhydro-3,4,6-tri-0-benzyl-P-D-mannopyranose, Carbohydr. Res., 135, 195-202, 1985. 

Yamamoto, H, Hanaya, T, Ohmori, K, Kawamoto, H, Synthesis of 5-deoxy-[(lf and S) methylphosphinyl]-a,p-D-mannopyranoses. The first P-in-ring sugar analogues of D-mannose type, Chem. Lett., 1471-1472, 1989. 

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