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31349-66-3

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31349-66-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 31349-66-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,3,4 and 9 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 31349-66:
(7*3)+(6*1)+(5*3)+(4*4)+(3*9)+(2*6)+(1*6)=103
103 % 10 = 3
So 31349-66-3 is a valid CAS Registry Number.

31349-66-3Relevant articles and documents

Facile synthesis of 5-To 7-membered benzolactam compounds via strongly facilitated electrophilic aromtic substitution reaction

Kurouchi, Hiroaki,Otani, Yuko,Ohwada, Tomohiko

, p. 705 - 713 (2017/04/10)

We employed our system to activate aromatic ring-Tethered carbamate compounds with trifluoromethanesulfonic acid to obtain benzolactams with 5-To 7-membered rings, and examined the substrate scope and limitations of this activation method. In 5-membered ring formation, a halogen group on the aromatic ring did not greatly affect the reaction yield, but other electron-donating groups inhibited the cyclization reaction, and various side-reactions occurred. In 7-membered ring formation, eletron-donating groups on aromatic ring promoted the cyclization reaction, but cyclization of electron-deficient aromatic rings did not proceed well. The 6-membered ring formation reaction showed the greatest substrate generality.

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