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204908-05-4

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204908-05-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 204908-05-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,9,0 and 8 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 204908-05:
(8*2)+(7*0)+(6*4)+(5*9)+(4*0)+(3*8)+(2*0)+(1*5)=114
114 % 10 = 4
So 204908-05-4 is a valid CAS Registry Number.

204908-05-4Downstream Products

204908-05-4Relevant articles and documents

Convenient one-pot method for the preparation of polysubstituted benzo[b]- and naphtho[1,2-b]-furans and -thiophenes

Katritzky, Alan R.,Serdyuk, Larisa,Xie, Linghong

, p. 1059 - 1064 (2007/10/03)

N-(Phenoxymethyl)- and N-(phenylthiomethyl)-benzotriazoles are versatile substrates for the preparation of benzofurans and benzothiophenes by insertion reactions of their anions into alkyl and aryl aldehydes and in situ cyclization of the α-aryloxy and α-arylthio ketones thus formed. N-(Naphthyloxy)- and N-(naphthylthio)-benzotriazoles are similarly efficient precursors for naphthofurans and naphthothiophenes.

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