172172-01-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 172172-01-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,1,7 and 2 respectively; the second part has 2 digits, 0 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 172172-01:
(8*1)+(7*7)+(6*2)+(5*1)+(4*7)+(3*2)+(2*0)+(1*1)=109
109 % 10 = 9
So 172172-01-9 is a valid CAS Registry Number.
172172-01-9Relevant academic research and scientific papers
Azirine/oxindole ring enlargement via amidinium intermediates
Mekhael, Maged K. G.,Bienz, Stefan,Linden, Anthony,Heimgartner, Heinz
, p. 2385 - 2404 (2007/10/03)
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
