189757-77-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 189757-77-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,7,5 and 7 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 189757-77:
(8*1)+(7*8)+(6*9)+(5*7)+(4*5)+(3*7)+(2*7)+(1*7)=215
215 % 10 = 5
So 189757-77-5 is a valid CAS Registry Number.
189757-77-5Relevant articles and documents
Synthesis of bulky bis(ether anhydride)s and poly(ether imide)s with bulky mainchain units
Eastmond, Geoffrey C.,Paprotny, Jerzy
, p. 589 - 592 (1997)
A series of bis(ether anhydride)s has been synthesized from very bulky bisphenols. Poly(ether imide)s have been synthesized from these bis(ether anhydride)s and two diamines in order to provide a series of poly(ether imide)s with bulky main-chain units. T
