220121-09-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 220121-09-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,0,1,2 and 1 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 220121-09:
(8*2)+(7*2)+(6*0)+(5*1)+(4*2)+(3*1)+(2*0)+(1*9)=55
55 % 10 = 5
So 220121-09-5 is a valid CAS Registry Number.
220121-09-5Relevant articles and documents
Synthesis and reactions of 1-azo-2-azoniaallene salts derived from pyridine derivatives
Amer, Atef M.
, p. 1293 - 1303 (1998)
The 1-aza-2-azonia-allene salts prepared from 3-acetyl- or 3-benzoyl-pyridine via the corresponding hydrazone and α-chloroaryl-azo derivatives react with propionitrile to afford the corresponding 3-(3-pyridyl)-1,2,4-triazolium salts. The intramolecular cy