81243-57-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81243-57-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,2,4 and 3 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 81243-57:
(7*8)+(6*1)+(5*2)+(4*4)+(3*3)+(2*5)+(1*7)=114
114 % 10 = 4
So 81243-57-4 is a valid CAS Registry Number.
81243-57-4Relevant articles and documents
Direction of deprotonation of 4-(3-indolyl)pyridinium salts in alkaline media
Zemskii,Sheinkman
, p. 1205 - 1207 (1982)
A proton is split out from the NH group of indole to give the anhydro bases in all cases when 4-(3-indolyl)pyridinium salts with alkyl, benzyl, phenacyl, and quinolylmethyl residues attached to the pyridinium nitrogen atom are treated with alkali.
