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204977-88-8

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204977-88-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 204977-88-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,9,7 and 7 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 204977-88:
(8*2)+(7*0)+(6*4)+(5*9)+(4*7)+(3*7)+(2*8)+(1*8)=158
158 % 10 = 8
So 204977-88-8 is a valid CAS Registry Number.

204977-88-8Downstream Products

204977-88-8Relevant articles and documents

A general synthesis of quinoline-2,5,8(1H)-triones via acylation of 2,5- dimethoxyaniline with S-tert-butyl thioacetates by application of the Knorr cyclization

López-Alvarado, Pilar,Avenda?o, Carmen,Menéndez, J. Carlos

, p. 186 - 194 (2007/10/03)

An efficient synthesis of quinoline-2,5,8(1H)-triones bearing alkyl groups at C3 and/or C4 is described. The reaction sequence employed involves Knorr cyclization of 2,5-dimethoxyanilides into 5,8- dimethoxyquinoline systems, followed by oxidative demethylation with cerium ammonium nitrate. The starting 2,5-dimethoxyanilides were prepared by chemoselective acylation of 2,5-dimethoxyaniline with a series of β-oxo thioesters obtained by regioselective alkylation of S-tert-butyl acetothioacetate (1) at C2 and/or C4. The introduction of electrophiles other than alkyl groups at C2 on 1 was also studied.

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