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128503-59-3

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128503-59-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128503-59-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,5,0 and 3 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 128503-59:
(8*1)+(7*2)+(6*8)+(5*5)+(4*0)+(3*3)+(2*5)+(1*9)=123
123 % 10 = 3
So 128503-59-3 is a valid CAS Registry Number.

128503-59-3Relevant articles and documents

Hydroxy group acidities of partially protected glycopyranosides

Matwiejuk, Martin,Thiem, Joachim

scheme or table, p. 2180 - 2187 (2012/06/30)

A comprehensive acidity study of carbohydrate hydroxy groups has been carried out. Relative acidities (Ke) were determined spectrophotometrically for partially methylated methyl α-D- glycopyranosides. Apparently, the acidity is strongly affected by intramolecular hydrogen bonding as well as stereochemistry and solvation. By comparison with pKe and pKa values of aliphatic alcohols and polyols the first estimation of the pKa values for partially protected glycopyranosides was obtained. These findings contribute to the understanding of the relative reactivities of carbohydrate hydroxy groups.

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