The Effect of Certain Sugar Alcohols and their Anhydrides on the Dissociation of Boric Acid.

Abstract

10 mm. was saponified. The calculated percentage of acetic acid is 72.31; that found was 71.70. The mannide was prepared by the method devised by Liebermann (8). Analysis gave: C, 48.37 per cent; H, 7.32 per cent.The calculated values are: C, 49.27 per cent; , 6.90 per cent. The isomannide was prepared by Fauconnier's method (9). The compound melted sharply at 87°C. (uncorrected).The dulcitol employed was Pfanstiehl's c.p. product, m.p. 188°C., free from galactose. The dulcitan was prepared by Berthelot's method (10).Analysis gave the following composition: C, 43.79 per cent; , 7.20 per cent. The calculated values are: C, 43.87 per cent; H, 7.37 per cent.

A Further Study of the Effect of Sugar Alcohols and their Anhydrides on the Dissociation of Boric Acid.

“…In a 4 per cent solution, its downward displacement of the titration curve of boric acid is greater than that of its mother substance, erythritol, with two more hydroxyl groups in the molecule, and also greater than that of the isomeric hexahydroxy sugar alcohols, mannitol, dulcitol, and sorbitol. In our previous studies (7) with the anhydrides of mannitol and dulcitol and in this work with 1,5-anhydromannitol, the removal of a molecule of water from the sugar alcohol with the formation of the oxide ring diminished greatly or obliterated its action on the dissociation constant of boric acid. In this regard erythritan is a striking exception.…”

“…following composition: carbon, 45.21 per cent; hydrogen, 7.56 per cent. The calculated values are: carbon, 46.15 per cent; hydrogen, 7.69 per cent.…”

SUGAR ALCOHOLS. X: The Effect of Certain Sugar Alcohols and Their Anhydrides on the Dissociation of Boric Acid

“…The mannitan was prepared from mannitol by a slight modification of the method of Vignon (13), in which the dehydration is accomplished by means of sulfuric acid. Analysis gave the following values: carbon, 44.08 per cent; hydrogen, 7.04 per cent. The calculated values are: carbon, 43.90 per cent; hydrogen, 7.32 per cent.…”

“…In previous communications the authors (7,8) have studied the influence of various sugar alcohols and their anhydrides on the dissociation of boric acid. Later the physicochemical properties of the erythritan-boric acid complex were studied (9).…”

Sugar Alcohols. IX. A Physicochemical Study of the Erythritan–Boric Acid Complex

“…

In previous communications the authors (5,4) studied the influence of certain of the sugar alcohols and their anhydrides upon the dissociation constant of boric acid. In one study (4) it was demonstrated that erythritan, 1,4-anhydroerythritoI, was unique among the compounds investigated, inasmuch as its downward displacement of the titration curve of boric acid was greater than that of any other compound.

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