221040-09-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221040-09-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,0,4 and 0 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 221040-09:
(8*2)+(7*2)+(6*1)+(5*0)+(4*4)+(3*0)+(2*0)+(1*9)=61
61 % 10 = 1
So 221040-09-1 is a valid CAS Registry Number.
221040-09-1Relevant articles and documents
Nucleophilic additions to fused benzimidazole N-oxides
Donaghy, Michael J.,Stanforth, Stephen P.
, p. 1441 - 1448 (1999)
The benzimidazoles 16a-f have been prepared from N-oxides 15a-d. Treatment of N-oxides 15c and 15d with a mixture of acetic anhydride and sodium acetate gave the corresponding acetoxy derivatives 26 and 27 via a regiospecific nucleophilic substitution rea