209802-40-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 209802-40-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,9,8,0 and 2 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 209802-40:
(8*2)+(7*0)+(6*9)+(5*8)+(4*0)+(3*2)+(2*4)+(1*0)=124
124 % 10 = 4
So 209802-40-4 is a valid CAS Registry Number.
209802-40-4Relevant academic research and scientific papers
Synthesis of New Proton-Ionizable Dibenzocrown Ethers
Kim, Jong Seung,Bartsch, Richard A.
, p. 285 - 292 (2007/10/03)
A series of structurally related dibenzo-15-crown-5, dibenzo-18-crown-6, and dibenzo-21-crown-7 compounds with oxymethylacetoxy side arms is synthesized by reaction of the corresponding crown ether alcohols with potassium hydride and bromoacetic acid. Mul
