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65837-54-9

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65837-54-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 65837-54-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,8,3 and 7 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 65837-54:
(7*6)+(6*5)+(5*8)+(4*3)+(3*7)+(2*5)+(1*4)=159
159 % 10 = 9
So 65837-54-9 is a valid CAS Registry Number.

65837-54-9Relevant articles and documents

Formation of 2,3-Dihydro-4(1H)-quinolones and Related Compounds via Fries-type Acid-catalysed Rearrangement of 1-Arylazetidin-2-ones

Kano, Shinzo,Ebata, Tsutomu,Shibuya, Shiroshi

, p. 2105 - 2111 (2007/10/02)

A variety of 1-arylazetidin-2-ones were treated with trifluoroacetic acid under reflux, methanesulphonic acid at 100 deg C, or conc. sulphuric acid to give the corresponding 2,3-dihydro-4(1H)-quinolones via acyl migration and N-CO fission.In the case of 1-(3-substituted phenyl)azetidin-2-ones, two positional isomeric products, 5- and 7-substituted 2,3-dihydro-4(1H)-quinolones were obtained. 4-Methyl, 4-ethoxycarbonyl, and 4-piperidin-2-yl-1-arylazetidin-2-ones and their analogues were also converted into the corresponding 2-substituted 2,3-dihydro-4(1H)-quinolones under acidic conditions.The 3-substituted 1-phenylazetidin-2-ones (36) and (37) were converted into the furoquinoline systems (38) and (40), respectively, by application of this method.

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