20897-42-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20897-42-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,9 and 7 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 20897-42:
(7*2)+(6*0)+(5*8)+(4*9)+(3*7)+(2*4)+(1*2)=121
121 % 10 = 1
So 20897-42-1 is a valid CAS Registry Number.
20897-42-1Relevant articles and documents
SYNTHESIS OF 1-AZIDOANTHRAQUINONES
Gornostaev, L. M.,Sakilidi, V. T.
, p. 1978 - 1981 (2007/10/02)
1-Azidoanthraquinones were synthesized by the reaction of 1-nitroanthraquinones with alkali-metal azides in polar aprotic solvents.The reaction is realized readily for various 1-nitroanthraquinones containing electron-donating and electron-withdrawing sub
