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21172-44-1

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21172-44-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21172-44-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,7 and 2 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21172-44:
(7*2)+(6*1)+(5*1)+(4*7)+(3*2)+(2*4)+(1*4)=71
71 % 10 = 1
So 21172-44-1 is a valid CAS Registry Number.

21172-44-1Relevant articles and documents

Synthetic and biotransformation studies on prochiral non-proteinogenic amino acids: Diethyl α-acetamido, α-alkylmalonates

Singh,Prasad,Errington,Belokon,Kochetkov,Saxena,Jain,Parmar

, p. 10 - 15 (2007/10/03)

Nine diethyl α-acetamido, α-alkylmalonates 3-11 (alkyl=methyl, benzyl, 3-fluorobenzyl, 4-fluorobenzyl, 2,6-difluorobenzyl, 3-trifluoromethylbenzyl, 4-trifluoromethylbenzyi, 2-chlorobenzyl and 3-chlorobenzyl) have been synthesised in three steps starting with diethyl malonate in overall yields of 49-90%. The structures of C-alkylated acetamidomalonates have been established on the basis of their speciral data, the structures of two compounds 9 and 11 are also confirmed on the basis of their X-ray crystallographic studies. Further, the X-ray crystal structure of the chiral monoethyl ester of α-acetamidomalonic acid 1 has been studied. None of our C-alkylated acetamidomalonate has been found to be a substrate for lipase-catalysed enantiodifferentiating deesterification/hydrolysis of the symmetric diester groups.

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