331994-09-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 331994-09-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,3,1,9,9 and 4 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 331994-09:
(8*3)+(7*3)+(6*1)+(5*9)+(4*9)+(3*4)+(2*0)+(1*9)=153
153 % 10 = 3
So 331994-09-3 is a valid CAS Registry Number.
331994-09-3Relevant articles and documents
Heterocyclization of derivatives of 4-oxoalkanoic acids to 1,5-disubstituted pyrrolin-2-ones
Egorova,Sedavkina,Timofeeva
, p. 694 - 697 (2007/10/03)
Conditions were developed for the synthesis and production of 1-aryl-5-alkyl(aryl)-3H- and 1-aryl-5-alkyl(aryl)-5H-pyrrolin-2-ones from the amides and esters of 4-oxoalkanoic acids. It was established that the yield and ratio of the 3H and 5H isomers depe