By Claude S. Hudson, etc.
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Chem. , in press. DESULFURIZATION BY RANEY NICKEL 19 Methanolysis of dihydrostreptomycin with subsequent acetylation of the products was found by Brink, Kuehl, Flynn and Folkers6' to give both anomeric forms of methyl pentaacetyldihydrostreptobiosaminide (LVI). Mercaptolysis of either of these anomers, followed by reacetylation, converted them into ethyl pentaacetylthiodihydrostreptobiosaminide (LVII) which was not isolated but immediately desulfurized to the acetylated anhydride LVIII, pentaacetyldihydrodesoxystreptobiosamine.
The crystals were filtered, washed with alcohol and ether and dried in vacm at 70". 8 g. c. -The synthetic sucrose1zobtained from a-D-glucose-1-phosphate and D-fructose through the action of the partially purified sucrose phosphorylase from Pseudomonas saccharophila possesses properties identical with those of natural sucrose. Its empirical formula obtained by elementary analysis is ClrHzaOll. The compound does not reduce Fehling solution before hydrolysis. ,After acid or enzymatic hydrolysis the phenylosaeone obtained from the inversion mixture is D-glucosaeone; the hydrolyzate also gives a positive Seliwanoff reaction for a ketose.
29 31 33 35 36 36 36 37 38 39 41 41 43 43 46 I. INTRODUCTION Sucrose is commercially the most important and quantitatively the most abundant sugar in the vegetable kingdom. It is readily formed as the result of the photosynthetic activity of practically all higher plants, constituting a reserve material used in cell respiration. The energy that is liberated in the latter process is utilized for metabolic activities of the plant such as in the synthesis of numerous organic compounds, including especially amino acids, proteins and fats.
Advances in Carbohydrate Chemistry, Vol. 5 by Claude S. Hudson, etc.