21977-67-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21977-67-3 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 7 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21977-67:
(7*2)+(6*1)+(5*9)+(4*7)+(3*7)+(2*6)+(1*7)=133
133 % 10 = 3
So 21977-67-3 is a valid CAS Registry Number.
21977-67-3Relevant academic research and scientific papers
Nitration of 3-aryl-4-acetylsydnones: preparation of 3-(3-nitroaryl)sydnones by using acetyl group as a blocking group
Tien, Hsien-Ju,Lin, Shaw-Tao,Sheu, Jinn-Tsair
, p. 1610 - 1613 (2007/10/02)
The 3-(3-nitroaryl)sydnones were prepared in good yields by the nitration of 3-aryl-4-acetylsydnones followed by deacetylation with aqueous barium hydroxide.
