851980-78-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 851980-78-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,5,1,9,8 and 0 respectively; the second part has 2 digits, 7 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 851980-78:
(8*8)+(7*5)+(6*1)+(5*9)+(4*8)+(3*0)+(2*7)+(1*8)=204
204 % 10 = 4
So 851980-78-4 is a valid CAS Registry Number.
851980-78-4Relevant articles and documents
Azirine/oxindole ring enlargement via amidinium intermediates
Mekhael, Maged K. G.,Bienz, Stefan,Linden, Anthony,Heimgartner, Heinz
, p. 2385 - 2404 (2004)
A novel general method for the synthesis of oxindoles, namely the 'azirine/oxindole ring enlargement via amidinium-intermediates' has been established: the reaction of 2H-azirin-3-amines 1 with BF3· OEt2 in THF solution at -78° leads