139688-84-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 139688-84-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,6,8 and 8 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 139688-84:
(8*1)+(7*3)+(6*9)+(5*6)+(4*8)+(3*8)+(2*8)+(1*4)=189
189 % 10 = 9
So 139688-84-9 is a valid CAS Registry Number.
139688-84-9Relevant academic research and scientific papers
5-Alkylidene-4,5-dihydro-1H-tetrazoles Substituted by Vinyl or Phenyl Groups
Quast, Helmut,Hergenroether, Thomas
, p. 581 - 590 (2007/10/02)
The nitriles 7e-k and 10 are methylated by methyl triflate to afford the N-methylnitrilium triflates 8e-k and 11 which are allowed to react with methyl azide to produce the tetrazolium triflates 9 * F3CSO3 and 12 * F3CSO3.The crystalline hexafluorophospha
