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13398-38-4

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13398-38-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 13398-38-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,3,9 and 8 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 13398-38:
(7*1)+(6*3)+(5*3)+(4*9)+(3*8)+(2*3)+(1*8)=114
114 % 10 = 4
So 13398-38-4 is a valid CAS Registry Number.

13398-38-4Relevant articles and documents

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Tatsumi,S. et al.

, p. 1818 - 1819 (1966)

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Synthesis of erythro-2-Hydroxy-3-methylbutane-1,4-dioic Acid

Bhat, K. S.,Dixit, K. N.,Rao, A. S.

, p. 509 - 512 (2007/10/02)

Reduction of ethyl 3-methyl-2-oxobutane-1,4-dioate (3) with sodium borohydride furnishes a 6:1 mixture of ethyl erythro-2-hydroxy-3-methylbutane-1,4-dioate (8) and ethyl threo-2-hydroxy-3-methylbutane-1,4-dioate (18).Hydrolysis of this mixture with aq. hydrochloric acid gives a mixture of acids from which pure erythro-2-hydroxy-3-methylbutane-1,4-dioic acid (4) has been isolated.The stereochemistry of 4 has been establishrd by PMR and by transforming it to the anhydride, erythro-dihydro-3-acetyloxy-4-methyl-2,5-furandione (26).

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