19842-71-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 19842-71-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,8,4 and 2 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 19842-71:
(7*1)+(6*9)+(5*8)+(4*4)+(3*2)+(2*7)+(1*1)=138
138 % 10 = 8
So 19842-71-8 is a valid CAS Registry Number.
19842-71-8Relevant articles and documents
Oxidation and halogenation of methyl 4,5,6,7-tetrafluorobenzothiophen-2-carboxylate
Shirley, I. M.
, p. 51 - 58 (2007/10/02)
4,5,6,7-tetrafluorobenzothiophen-2-carboxylic acid (IA) was prepared by a modified literature procedure in two steps from pentafluorobenzaldehyde and rhodanine.Its methyl ester (IB) was synthesised via the acid chloride (IC) by reaction with methanol.O
