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84557-87-9

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84557-87-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 84557-87-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,5,5 and 7 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 84557-87:
(7*8)+(6*4)+(5*5)+(4*5)+(3*7)+(2*8)+(1*7)=169
169 % 10 = 9
So 84557-87-9 is a valid CAS Registry Number.

84557-87-9Relevant articles and documents

Intramolecular polar [4·+2] cycloadditions of aryl-1-aza-2-azoniaallene salts: Unprecedented reactivity leading to polycyclic protonated azomethine imines

Bercovici, Daniel A.,Ogilvie, Jodi M.,Tsvetkov, Nikolay,Brewer, Matthias

, p. 13338 - 13341 (2013)

Charged up: In the first example of the title salts undergoing a [4 ·+2]cycloaddition reaction, the azo bond and one aromatic πbond make up the 4πcomponent. This reaction appears to be concerted and provides high yields of protonated azomethine imine products. Substituted alkenes provided products containing all-carbon or nitrogen-bearing quaternary centers in high yield.

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