74133-21-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 74133-21-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,1,3 and 3 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 74133-21:
(7*7)+(6*4)+(5*1)+(4*3)+(3*3)+(2*2)+(1*1)=104
104 % 10 = 4
So 74133-21-4 is a valid CAS Registry Number.
74133-21-4Relevant articles and documents
A CONVENIENT SYNTHESIS OF 8-OXOPROTOBERBERINE DERIVATIVES
Ruchirawat, Somsak,Lertwanawatana, Werawat,Thepchumrune, Pongtip
, p. 189 - 192 (1980)
The annulation of isoquinoline derivatives to form the 8-oxoprotoberberine derivatives is described.The key step of the reaction involves intramolecular alkylation of the Reissert compounds.
