640273-16-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 640273-16-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,0,2,7 and 3 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 640273-16:
(8*6)+(7*4)+(6*0)+(5*2)+(4*7)+(3*3)+(2*1)+(1*6)=131
131 % 10 = 1
So 640273-16-1 is a valid CAS Registry Number.
640273-16-1Relevant articles and documents
1,1-Disubstituted tetrahydroisoquinolines from enaminones via Pictet-Spengler reaction
Venkov, Atanas P.,Angelov, Plamen A.
, p. 3025 - 3033 (2007/10/03)
Enaminones, prepared by condensation of homoveratrylamine with 1,3-dicarbonyl compounds, undergo intramolecular cyclization in acidic media to afford 1,1-disubstituted tetrahydroisoquinolines in good yields. Further modification of the title compounds is