Glucopyranose barium hydroxide

In 1932 Lieser and his associates, following some work on the constitution of cellulose xanthate, which had indicated C2 as the probable position of substitution in the D-glucopyranose residue, embarked on a study of the xanthation of other carbohydrates and polyhydric alcohols. In the first paper of the new series, Lieser and Nagel, having failed to obtain an 0-(thiolthiocarbonyl) derivative of glyceritol under anhydrous conditions, introduced the use of aqueous barium hydroxide as the basic reagent. The... 

Levoglucosan (l,6-anhydro-/3-D-glucopyranose) was first isolated and characterized as its triacetate and tribenzoate by Tanret, who obtained this compound through the treatment of natural phenolic D-glucosides (picein, salicin, and coniferin) with barium hydroxide. 

In view of certain structural similarities, it is appropriate to consider these polysaccharides together. The acidic, capsular polysaccharide of Type III pneumococcus ([a]n —32.2° acid equivalent, 346 and nitrogen, 0.05%) is precipitable by barium hydroxide, heavy-metal salts, and hydrochloric acid. On acidic hydrolysis, it yields a small proportion of D-glucose together with an aldobiouronic acid identified as cello-biouronic acid [4-0-(/3-D-glucopyranosyluronic acid)-D-glucopyranose] by methylation and hydrolysis. Optical rotation data suggested that the... 

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