271787-84-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 271787-84-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,7,1,7,8 and 7 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 271787-84:
(8*2)+(7*7)+(6*1)+(5*7)+(4*8)+(3*7)+(2*8)+(1*4)=179
179 % 10 = 9
So 271787-84-9 is a valid CAS Registry Number.
271787-84-9Relevant academic research and scientific papers
4-derivatives coumarin-3-phosphonic acids and esters
Kostka, Krzysztof,Pastuszko, Slawomir,Kotynski, Andrzej,Budzisz, Elzbieta
, p. 199 - 209 (2007/10/03)
In the Arbuzov reactions of 2′-bromoacetoxyphenone with trimethyl phosphite the derivatives in position 4 of 3-phosphonocoumarinic acids and esters were obtained.
