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20949-91-1

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20949-91-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20949-91-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,9,4 and 9 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 20949-91:
(7*2)+(6*0)+(5*9)+(4*4)+(3*9)+(2*9)+(1*1)=121
121 % 10 = 1
So 20949-91-1 is a valid CAS Registry Number.

20949-91-1Relevant articles and documents

A novel ring transformation of 5-azidothiazoles

Ceulemans, Erik,Dyall, Leonard K.,Dehaen, Wim

, p. 1977 - 1988 (2007/10/03)

The 4-oxoalkyl- and 4-iminoalkyl-5-azidothiazoles undergo a ring transformation with nitrogen loss at relatively low temperatures to afford 4- cyanooxazoles and 4-cyanoimidazoles, respectively. The mechanism, which is thought to involve a ring opening-ring closure process, is discussed.

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