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21971-25-5

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21971-25-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21971-25-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,7 and 1 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 21971-25:
(7*2)+(6*1)+(5*9)+(4*7)+(3*1)+(2*2)+(1*5)=105
105 % 10 = 5
So 21971-25-5 is a valid CAS Registry Number.

21971-25-5Relevant articles and documents

Construction of 1,4-benzodiazepine skeleton from 2-(arylamino)benzamides through PhI(OAc)2-mediated oxidative C-N bond formation

Li, Xuming,Yang, Liu,Zhang, Xiang,Zhang-Negrerie, Daisy,Du, Yunfei,Zhao, Kang

, p. 955 - 962 (2014/03/21)

New compounds involving the biologically important 1,4-benzodiazepine skeleton were conveniently constructed from 2-(arylamino)benzamides through PhI(OAc)2-mediated oxidative C-N bond formation. The attractive features of this new synthetic strategy include mild reaction conditions, the heavy-metal-free characteristic of the oxidative coupling process, and the flexibility to tolerate a broad scope of substrates.

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