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215609-09-9

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215609-09-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 215609-09-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,5,6,0 and 9 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 215609-09:
(8*2)+(7*1)+(6*5)+(5*6)+(4*0)+(3*9)+(2*0)+(1*9)=119
119 % 10 = 9
So 215609-09-9 is a valid CAS Registry Number.

215609-09-9Relevant articles and documents

Synthesis of tricarbonylmethane derivatives of pyridines, pyrimidines, pyridazines, and pyrazoles by anionic ortho-Fries rearrangement

Schnell, Barbara,Kappe, Thomas

, p. 871 - 885 (1998)

Heterocyclic 1,3-dicarbonyl systems, such as 4-hydroxy-2-pyridones, 6-hydroxy-4-pyrimidones, and 5-hydroxy-1-phenyl-3-pyrazolones, are converted with a number of aromatic acid chlorides to their enol esters which can be rearranged in the presence of KCN, triethylamine, and 18-crown-6 as catalyst to yield heterocyclic aryl ketones. This reaction can also be performed in a one-pot procedure without isolation of the esters. Aryl esters of 5-hydroxy-3-pyridazinone can be prepared in the same manner, but not be rearranged.

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