22228-57-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 22228-57-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,2,2 and 8 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 22228-57:
(7*2)+(6*2)+(5*2)+(4*2)+(3*8)+(2*5)+(1*7)=85
85 % 10 = 5
So 22228-57-5 is a valid CAS Registry Number.
22228-57-5Relevant articles and documents
Synthesis of 2,2'-Disubstituted and 2,2',3,3'-Tetrasubstituted -4,4'(3H,3'H)-diones
Suthar, B. P.
, p. 588 - 589 (2007/10/02)
2,2'-Disubstituted -4,4'-diones react with ammonia, methylamine and aniline above 80 deg C affording the title compounds (Ia-k).These compounds have also been prepared by the modified Niementowski synthesis using appropriate dia