139157-53-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 139157-53-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,1,5 and 7 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 139157-53:
(8*1)+(7*3)+(6*9)+(5*1)+(4*5)+(3*7)+(2*5)+(1*3)=142
142 % 10 = 2
So 139157-53-2 is a valid CAS Registry Number.
139157-53-2Relevant academic research and scientific papers
Selective N-1 Alkylation of Unsymmetrically Substituted Pyrazoles
Malhotra, Nageshwar,Faelt-Hansen, Birgitte,Becher, Jan
, p. 1837 - 1839 (2007/10/02)
A series of C-substituted pyrazoles have been N-alkylated.The alkylation occurs preferentially at the N-1 position when a tert-butyl group is present at the pyrazole C-3 position.
