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439797-74-7

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439797-74-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 439797-74-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,9,7,9 and 7 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 439797-74:
(8*4)+(7*3)+(6*9)+(5*7)+(4*9)+(3*7)+(2*7)+(1*4)=217
217 % 10 = 7
So 439797-74-7 is a valid CAS Registry Number.

439797-74-7Relevant articles and documents

Stereoselective synthesis of chloramphenicol from D-serine

Veeresa,Datta, Apurba

, p. 8503 - 8004 (2007/10/03)

An efficient synthesis of the widely used antibiotic chloramphenicol (1) is described. The key step in the synthesis involves chelation-controlled addition of phenylmagnesium bromide to a suitably protected D-serinal derivative, affording the pivotal D-threo 1,2-amino alcohol intermediate 3 in a highly stereoselective manner.

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