820243-52-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 820243-52-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,2,0,2,4 and 3 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 820243-52:
(8*8)+(7*2)+(6*0)+(5*2)+(4*4)+(3*3)+(2*5)+(1*2)=125
125 % 10 = 5
So 820243-52-5 is a valid CAS Registry Number.
820243-52-5Relevant articles and documents
Expedient total syntheses of rhein and diacerhein via fries rearrangement
Tisserand, Steve,Baati, Rachid,Nicolas, Marc,Mioskowski, Charles
, p. 8982 - 8983 (2004)
Short and practical total syntheses of rhein (1) and diacerhein (2) have been achieved via a Fries rearrangement and bis-carbonylation strategy followed by cyclization in molten salt, starting from dibromoester 7.
