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54986-63-9

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54986-63-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 54986-63-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,9,8 and 6 respectively; the second part has 2 digits, 6 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 54986-63:
(7*5)+(6*4)+(5*9)+(4*8)+(3*6)+(2*6)+(1*3)=169
169 % 10 = 9
So 54986-63-9 is a valid CAS Registry Number.
InChI:InChI=1/C20H16/c1-13-11-15-12-14(2)17-8-4-6-10-19(17)20(15)18-9-5-3-7-16(13)18/h3-12H,1-2H3

54986-63-9Downstream Products

54986-63-9Relevant articles and documents

Domino Friedel-crafts-type cyclizations of difluoroalkenes promoted by the α-cation-stabilizing effect of fluorine: An efficient method for synthesizing angular PAHs

Fuchibe, Kohei,Jyono, Hideharu,Fujiwara, Masaki,Kudo, Takao,Yokota, Misaki,Ichikawa, Junji

scheme or table, p. 12175 - 12185 (2011/12/01)

In order to synthesize polycyclic aromatic hydrocarbons with nonlinear arrangements (angular PAHs), acid-promoted domino cyclizations of 1,1-difluoroalk-1-enes and 1,1-difluoroalka-1,3-dienes were studied. 1,1-Difluoroalkenes, each bearing two aryl substituents, were regioselectively protonated with FSO3H·SbF5 to generate fluorine-stabilized carbocations, which readily underwent domino Friedel-Crafts-type cyclizations to give carbocycles based on 6/n/m/6 ring systems (n,m=5-7) in good to high yields. Protonation of 1,1-difluoroalka-1,3- dienes took place at their electron-rich methylene (CH2) carbon atoms in the presence of milder acids such as camphorsulfonic acid and trifluoromethanesulfonic acid. Domino cyclizations of the resulting fluorine-stabilized allylic carbocations afford carbocycles based on 6/6/6/6 or 6/6/5/6 ring systems in high yields.

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