74990-05-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 74990-05-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,9,9 and 0 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 74990-05:
(7*7)+(6*4)+(5*9)+(4*9)+(3*0)+(2*0)+(1*5)=159
159 % 10 = 9
So 74990-05-9 is a valid CAS Registry Number.
74990-05-9Relevant articles and documents
Synthesis of Some 1,3,5-Triaryl-2-pyrazolin-4-ones and Their Thio Analogues
Dora, E. K.,Dash, B.,Panda, C. S.
, p. 68 - 70 (2007/10/02)
Reaction of various chalkone dibromides with phenylhydrazine and 2,4-dinitrophenylhydrazine gives quantitatively, the novel 1,3,5-triaryl-4-bromo-2-pyrazolines (I) which are easily converted into 1,3,5-triaryl-2-pyrazolin-4-ones (II) in DMSO at room tempe
