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74254-53-8

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74254-53-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 74254-53-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,2,5 and 4 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 74254-53:
(7*7)+(6*4)+(5*2)+(4*5)+(3*4)+(2*5)+(1*3)=128
128 % 10 = 8
So 74254-53-8 is a valid CAS Registry Number.

74254-53-8Relevant articles and documents

Synthesis of the 2-ethyl-3-methylsuccinic acids via a stereospecific malonic ester alkylation

Leeuwen, F. F. van,Noordam, A.,Maat, L.,Beyerman, H. C.

, p. 96 - 99 (2007/10/02)

Reaction of (-)-(S)-methyl 2-bromopropionate (4) (obtained from L-alanine) with dibenzyl ethylmalonate gave stereospecifically in four steps (+)-(2R,3S)-2-ethyl-3-methylsuccinic acid (8a) and its diastereoisomer (8b).The malonic ester alkylation proceeded with Walden inversion.The chiroptical properties of the acids and the intermediates are in conformity with the known absolute configurations.

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