71784-21-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 71784-21-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,7,8 and 4 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 71784-21:
(7*7)+(6*1)+(5*7)+(4*8)+(3*4)+(2*2)+(1*1)=139
139 % 10 = 9
So 71784-21-9 is a valid CAS Registry Number.
71784-21-9Relevant articles and documents
Short Chain Acyclic Crown Ethers
Lin, Whei Oh,Souza, Maria Cecilia Bastos Vieira
, p. 253 - 258 (1981)
A series of short chain acyclic crown ethers such as (1,2), (1,3), (1,4)-phenylenediethers and some symmetric or asymmetric o-substituted phenyl ethers were prepared.The complexation studies of these compounds were carried out by a) direct UV titration me
