128256-19-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 128256-19-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,2,5 and 6 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 128256-19:
(8*1)+(7*2)+(6*8)+(5*2)+(4*5)+(3*6)+(2*1)+(1*9)=129
129 % 10 = 9
So 128256-19-9 is a valid CAS Registry Number.
128256-19-9Relevant articles and documents
A convenient synthesis of Quinazoline ring by tandem aza-Wittig reaction/electrocyclic ring closure
Rossi,Calabrese,Farma
, p. 5819 - 5834 (2007/10/02)
3,4-D-Dihydroquinazolines and Quinazolines were prepared starting from N'-aryl-N-(triphenylphosphoranilidene)-carboximidamides and aliphatic or aromatic aldehydes. The mechanism of the reaction is discussed.