21081-58-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21081-58-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,8 and 1 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21081-58:
(7*2)+(6*1)+(5*0)+(4*8)+(3*1)+(2*5)+(1*8)=73
73 % 10 = 3
So 21081-58-3 is a valid CAS Registry Number.
21081-58-3Relevant academic research and scientific papers
Synthesis of 4-Acyl- and 4-Alkoxy-carbonylpyrazoles
Al-Saleh, Fowzia S.,Khawaja, Ibtisam K. Al,Joule, John A.
, p. 642 - 645 (2007/10/02)
N'-Aroyl- or N'-acetyl, N'-phenyl- or N'-methyl-hydrazino-derivatives (1) of 1,3-dicarbonyl compounds can be converted by mild base treatment into 5-aryl- or 5-methyl-, 1-phenyl- or 1-methylpyrazoles carrying an acyl or alkoxycarbonyl group at C-4.
