137791-20-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 137791-20-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,7,9 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 137791-20:
(8*1)+(7*3)+(6*7)+(5*7)+(4*9)+(3*1)+(2*2)+(1*0)=149
149 % 10 = 9
So 137791-20-9 is a valid CAS Registry Number.
137791-20-9Relevant articles and documents
HALOGENATION OF TRIS(ARYLAMINO)PHOSPHAZOBENZENES
Kostina, V. G.,Rutkovskii, E. K.,Feshchenko, N. G.
, p. 767 - 770 (2007/10/02)
Mild selective replacement of the hydrogen atoms by halogens in the para position of all four benzene rings occurs in the action of halogens (Br, I) on tris(arylamino)phosphazobenzenes.Electrophilic substitution reactions in phosphazobenzenes proceed cons
