128256-20-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 128256-20-2 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, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 128256-20:
(8*1)+(7*2)+(6*8)+(5*2)+(4*5)+(3*6)+(2*2)+(1*0)=122
122 % 10 = 2
So 128256-20-2 is a valid CAS Registry Number.
128256-20-2Relevant articles and documents
Quinazolines by electrocyclic ring closure of 1,3-diaza-1,3-dienes
Rossi, Elisabetta,Celentano, Giuseppe,Stradi, Riccardo,Strada, Alberto
, p. 903 - 906 (1990)
N-imidoyliminotripheny]phosphorane reacts with aliphatic and aromatic aldehydes to give via an 1,3-diaza-1,3-diene intermediate 3,4-dihydro quinazolines and quinazolines. The ratio between the reaction products depends from the aldehyde employed.
