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480997-20-4

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480997-20-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 480997-20-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,8,0,9,9 and 7 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 480997-20:
(8*4)+(7*8)+(6*0)+(5*9)+(4*9)+(3*7)+(2*2)+(1*0)=194
194 % 10 = 4
So 480997-20-4 is a valid CAS Registry Number.

480997-20-4Upstream product

480997-20-4Relevant articles and documents

Stereoselective synthesis of 1,2- and 1,4-dihydropyridines by using cation-π interaction as a conformation-controlling tool

Yamada, Shinji,Saitoh, Momoe,Misono, Tomoko

, p. 5853 - 5857 (2002)

Selective shielding of one side of the pyridinium face by way of intramolecular cation-π complex formation enabled nucleophiles to attack the pyridinium ring from the non-shielded side. As a result, 1,2- and 1,4-dihydropyridines were formed in good stereoselectivities. 1H NMR analysis and ab initio calculations at the RHF/3-21G* level supported the existence of cation-π interaction between the pyridinium and the aromatic ring of the chiral auxiliary.

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