Download Advances in Carbohydrate Chemistry, Vol. 5 by Claude S. Hudson, etc. PDF

By Claude S. Hudson, etc.

ISBN-10: 012007205X

ISBN-13: 9780120072057

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Chem. , 969 (1947). (64) D. A. Prins, J . Am. Chem. , 70, 3955 (1948); H. Hauenstein and T. Reichatein, Helv. Chim. Ada, 92, 22 (1949). (66) M. L. Wolfrom and J. V. Karabinos, J . Am. Chem. , 68,724, 1455 (1946). (66) Personal communication from Dr. J. V. Karabinos. Subsequent work on the reduction of steroid acids by Spero, McIntosh and Levin (ref. 12) has shown that Raney nickel partially deactivated by acetone is particularly suitable for the desulfurization of thiol esters to aldehydes. DESULFURIZATION BY RANEY NICKEL 23 freshly prepared material ; almost simultaneous work by Jeger, Norymberski, Szpilfogel and Preloge7 showed that fresh Raney nickel readily carries the thiol ester over to the alcohol stage.

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.

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.

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