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217661-64-8

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217661-64-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 217661-64-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,7,6,6 and 1 respectively; the second part has 2 digits, 6 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 217661-64:
(8*2)+(7*1)+(6*7)+(5*6)+(4*6)+(3*1)+(2*6)+(1*4)=138
138 % 10 = 8
So 217661-64-8 is a valid CAS Registry Number.

217661-64-8Relevant articles and documents

Stereoselective synthesis of chloramphenicol from D-serine

Veeresa,Datta, Apurba

, p. 8503 - 8004 (1998)

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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