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228552-98-5

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228552-98-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 228552-98-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,8,5,5 and 2 respectively; the second part has 2 digits, 9 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 228552-98:
(8*2)+(7*2)+(6*8)+(5*5)+(4*5)+(3*2)+(2*9)+(1*8)=155
155 % 10 = 5
So 228552-98-5 is a valid CAS Registry Number.

228552-98-5Relevant articles and documents

Intramolecular Friedel-Crafts alkylation promoted by the cross conjugated β-keto ester system. An efficient approach to highly functionalized hydrophenanthrenes and hydrochrysenes

Liu, Hsing-Jang,Tran, Duong Duc-Phi

, p. 3827 - 3830 (2007/10/03)

The cross conjugated β-keto ester system was shown to be an excellent promoter for the intramolecular Friedel-Crafts alkylation to facilitate the rapid construction of highly functionalized phenanthrene and chrysene derivatives.

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