2123-71-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 2123-71-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,1,2 and 3 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 2123-71:
(6*2)+(5*1)+(4*2)+(3*3)+(2*7)+(1*1)=49
49 % 10 = 9
So 2123-71-9 is a valid CAS Registry Number.
2123-71-9Relevant articles and documents
Novel electrophilic ipso acylation - Detosylation reaction of pyrroles
Pelkey, Erin T.,Gribble, Gordon W.
, p. 1338 - 1342 (2007/10/03)
A pyrrole and two pyrroloindoles that are substituted with a p-toluenesulfonyl group undergo an ipso acylation - detosylation reaction with acid chlorides and aluminum chloride to afford the corresponding acyl-substituted pyrroles and pyrroloindoles.