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3553-57-9

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3553-57-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 3553-57-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,5,5 and 3 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 3553-57:
(6*3)+(5*5)+(4*5)+(3*3)+(2*5)+(1*7)=89
89 % 10 = 9
So 3553-57-9 is a valid CAS Registry Number.

3553-57-9Relevant articles and documents

Facile synthesis of 2-azaazulenes from thiobenzoyl isocyanates using trimethylsilyldiazomethane

Morita, Mikio,Hari, Yoshiyuki,Iguchi, Tomoe,Aoyama, Toyohiko

, p. 1753 - 1758 (2008/09/17)

The reaction of trimethylsilyldiazomethane with thiobenzoyl isocyanates, in situ generated from thiazole-4,5-diones, yielded diazoketones, which were converted into 2-azaazulenes by the intramolecular Buchner reaction.

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