91791-23-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91791-23-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,7,9 and 1 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 91791-23:
(7*9)+(6*1)+(5*7)+(4*9)+(3*1)+(2*2)+(1*3)=150
150 % 10 = 0
So 91791-23-0 is a valid CAS Registry Number.
91791-23-0Relevant articles and documents
S-Alkyl-4-oxothianium Ions for the Synthesis of Cyclopentenones. Acid-Catalyzed Cyclization of Divinyl Ketones
Matsuyama, Haruo,Takei, Yuji,Kobayashi, Michio
, p. 2657 - 2659 (1986)
A new approach to 2-cyclopentenones via an acidic cyclization of divinyl ketones by the use of S-alkyl-4-oxothianium ions as key compounds is described.