7721-49-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7721-49-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,2 and 1 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7721-49:
(6*7)+(5*7)+(4*2)+(3*1)+(2*4)+(1*9)=105
105 % 10 = 5
So 7721-49-5 is a valid CAS Registry Number.
7721-49-5Relevant articles and documents
First Example of Predominant β-Orientation in Electrophilic Substitution of Pyrrole
Speranza, Maurizio
, p. 1177 - 1178 (1981)
The isomeric distribution of the neutral products from the gas-phase electrophilic attack of 3He3H+, CH3FCH3+, and t-C4H9+ ions on pyrrole provides the first experimental evidence for predominant β-orientation in electrophilic substitution of pyrrole .