87839-57-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 87839-57-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,8,3 and 9 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 87839-57:
(7*8)+(6*7)+(5*8)+(4*3)+(3*9)+(2*5)+(1*7)=194
194 % 10 = 4
So 87839-57-4 is a valid CAS Registry Number.
87839-57-4Relevant articles and documents
RING LITHIATION OF PYRIDONES
Meghani, Premji,Joule, John A.
, p. 1 - 8 (2007/10/02)
Lithiation of 1-methyl-2-pyridone takes place mainly at the methyl group which then leads to a dimer (11) by addition to a second mol equivalent of pyridone at C-6.Lithiation of 1-methyl-4-pyridone takes place cleanly and efficiently at C-2; this lithio d
