111997-56-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 111997-56-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,9,9 and 7 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 111997-56:
(8*1)+(7*1)+(6*1)+(5*9)+(4*9)+(3*7)+(2*5)+(1*6)=139
139 % 10 = 9
So 111997-56-9 is a valid CAS Registry Number.
111997-56-9Relevant articles and documents
An expeditious, solvent-free synthesis of some 5-aryl-2-(2-hydroxyphenyl)- 1,3,4-oxadiazoles
Saeed, Aamer
, p. 1072 - 1075 (2008/09/18)
An efficient, rapid, microwave-accelerated one-step synthesis of some 5-aryl-2-(2-hydroxy-phenyl)-1,3,4-oxadiazoles by reaction of salicylic hydrazide with carboxylic acids in the presence of thionyl chloride under neat conditions is described.