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204520-35-4

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204520-35-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 204520-35-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,5,2 and 0 respectively; the second part has 2 digits, 3 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 204520-35:
(8*2)+(7*0)+(6*4)+(5*5)+(4*2)+(3*0)+(2*3)+(1*5)=84
84 % 10 = 4
So 204520-35-4 is a valid CAS Registry Number.

204520-35-4Relevant articles and documents

Synthesis of 2-aroylquinoxalines, 1-aroylphthalazines, and 4-aroylcinnolines; an aroylation method using arenecarbaldehydes catalyzed by azolium salt1

Miyashita, Akira,Suzuki, Yumiko,Iwamoto, Ken-Ichi,Oishi, Etsuo,Higashino, Takeo

, p. 405 - 413 (1998)

2-Aroylquinoxalines (5,6), 1-aroylphthalazines (10,11), and 4-aroylcinnolines (13) were synthesized by using arenecarbaldehydes (2) in the presence of an azolium salt (1) in moderate to good yields. 1,3-Dimethylimidazolium iodide (1a) and sodium sulfinate

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