221558-19-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221558-19-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,5,5 and 8 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 221558-19:
(8*2)+(7*2)+(6*1)+(5*5)+(4*5)+(3*8)+(2*1)+(1*9)=116
116 % 10 = 6
So 221558-19-6 is a valid CAS Registry Number.
221558-19-6Relevant 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.
