21690-90-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21690-90-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,9 and 0 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 21690-90:
(7*2)+(6*1)+(5*6)+(4*9)+(3*0)+(2*9)+(1*0)=104
104 % 10 = 4
So 21690-90-4 is a valid CAS Registry Number.
21690-90-4Relevant academic research and scientific papers
EFFICIENT OXYGENATION OF THIOPHOSPHORYL AND SELENOPHOSPHORYL GROUPS USING TRIFLUOROACETIC ANHYDRIDE
Helinski, Jan,Skrzypczynski, Zbigniew,Wasiak, Jacek,Michalski, Jan
, p. 4081 - 4084 (2007/10/02)
Trifluoroacetic anhydride reacts with organophosphorus compounds containing thiophosphoryl and selenophosphoryl groups converting them in high yield to the corresponding oxygenated systems.
