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173776-65-3

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173776-65-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 173776-65-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,7,7 and 6 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 173776-65:
(8*1)+(7*7)+(6*3)+(5*7)+(4*7)+(3*6)+(2*6)+(1*5)=173
173 % 10 = 3
So 173776-65-3 is a valid CAS Registry Number.

173776-65-3Relevant articles and documents

Efficient syntheses of 2-(3',5'-difluorophenyl)-3-(4'- methylsulfonylphenyl)-cyclopent-2-enone, a potent COX-2 inhibitor

Zhao, Dalian,Feng, Xu,Chen, Cheng-yi,Tillyer, Rich D.,Grabowski, Edward J. J.,Reider, Paul J.,Black, Cameron,Quimet, Nathalie,Prasit, Peppi

, p. 6001 - 6018 (2007/10/03)

2-(3',5'-Difluorophenyl)-3-(4'-methylsulfonylphenyl)cyclopent-2-enone (1) displays high selectivity and potency against COX-2. Three efficient syntheses of this diarylcyclopentenone are described. The first approach employs a Suzuki coupling reaction as the key step while the second synthesis features an intramolecular Friedel-Crafts acylation. The third, and preferred route to this compound involves a sequential malonate alkylation and acylation and ring-closure sequence.

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