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17021-40-8

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17021-40-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 17021-40-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,0,2 and 1 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 17021-40:
(7*1)+(6*7)+(5*0)+(4*2)+(3*1)+(2*4)+(1*0)=68
68 % 10 = 8
So 17021-40-8 is a valid CAS Registry Number.

17021-40-8Downstream Products

17021-40-8Relevant academic research and scientific papers

Novel Preparation of N-Protected Amino Acid Active Esters Using 1,2,2,2-Tetrachloroethyl Carbonates

Jaoudai, Mahmoud,Martinez, Jean,Castro, Bertrand

, p. 2364 - 2367 (2007/10/02)

1,2,2,2-Tetrachloroethyl chloroformate reacts with substituted phenols or N-hydroxy imides to yield crystalline and stable mixed aryl or oximido tetrachloroethyl carbonates.When allowed to react with an N-protected amino acid derivative, these compounds proved to be efficient for the syntheses of the corresponding active esters.A series of active esters including p-nitrophenol, trichlorophenol, pentafluorophenol, and N-hydroxysuccinimide derivatives were prepared by this new procedure.

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