133319-21-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 133319-21-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,3,1 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 133319-21:
(8*1)+(7*3)+(6*3)+(5*3)+(4*1)+(3*9)+(2*2)+(1*1)=98
98 % 10 = 8
So 133319-21-8 is a valid CAS Registry Number.
133319-21-8Relevant articles and documents
Photo-Cycloaddition Reactions of 2-Pyrones
Somekawa, Kenichi,Shimo, Tetsuro,Yoshimura, Hiroyuki,Suishu, Takaaki
, p. 3456 - 3461 (2007/10/02)
Sensitized photoreactions of two 2-pyrones with five unsaturated compounds were investigated.The reactions of 2-pyrones with electron-deficient ethylenes gave cycloadducts (3) and cycloadducts (4) across the C5-C6 double bonds in the 2-pyrones.O