91221-87-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91221-87-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,2,2 and 1 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 91221-87:
(7*9)+(6*1)+(5*2)+(4*2)+(3*1)+(2*8)+(1*7)=113
113 % 10 = 3
So 91221-87-3 is a valid CAS Registry Number.
91221-87-3Relevant academic research and scientific papers
Xanthones from Chromone Derivatives
Eiden, Fritz,Rademacher, Gerd,Schuenemann, Juergen
, p. 539 - 547 (2007/10/02)
The 3-acyl-2-(methylthio)chromones 2a-2c and the 6-acetyl-7-(methylthio)furochromone 10 react with the CH-acidic compounds 5a-5f, 11 and potassium tert.-butylate to yield the 3-acylchromones 4a-4d and 9, the xanthones 1 and 6a-6d and the furoxanthones 13a
