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3,4-O-Benzylidene-D-erythro-pentulosono-1,5-lactone hydrate is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.

138760-69-7

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138760-69-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138760-69-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,7,6 and 0 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 138760-69:
(8*1)+(7*3)+(6*8)+(5*7)+(4*6)+(3*0)+(2*6)+(1*9)=157
157 % 10 = 7
So 138760-69-7 is a valid CAS Registry Number.

138760-69-7Downstream Products

138760-69-7Relevant academic research and scientific papers

Synthesis of D-erythroascorbic acid from D-glucose

Gan, Li-Xian,Seib, Paul A.

, p. 117 - 126 (1991)

Reaction of a 4:1 mixture of D-ribono- and D-arabinono-1,4-lactones with benzaldehyde and hydrochloric acid gave 59percent crystalline 3,4-O-benzylidene-D-ribono-1,5-lactone.This acetal was oxidized with manganese dioxide in acetone to its 2-keto-derivative (6) in 76percent yield.Acid-catalyzed methanolysis of 6 gave a syrupy mixture of products, which upon tautomerization in hot methanolic sodium acetate followed by removal of sodium ions gave 78percent D-erythroascorbic acid (7).The overall yield of 7 starting from D-glucose was 20percent.

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