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81044-73-7

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81044-73-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81044-73-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,0,4 and 4 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81044-73:
(7*8)+(6*1)+(5*0)+(4*4)+(3*4)+(2*7)+(1*3)=107
107 % 10 = 7
So 81044-73-7 is a valid CAS Registry Number.

81044-73-7Downstream Products

81044-73-7Relevant articles and documents

Intramolecular Cyclization of Peri-Substituted 1-Azidonaphthalenes. 3. Structural and Chemical Investigation of 1-(Arylamino)benzindazol-8(and -6)(1H)-ones Produced by Decomposition of Hydroxy-Substituted 8-Azido-1-(arylazo)naphthalenes

Montevecchi, P. Carlo,Spagnolo, Piero

, p. 1996 - 2000 (2007/10/02)

Thermal and photochemical decomposition of 8-azido-2-hydroxy-1-(arylazo)naphthalenes 3a-d leads to 1-(arylamino)benzindazol-8(1H)-ones 4a-d in good yields.Analogous results are obtained in the conversion of 5 into 6.The reactions appear to proceed through 1,5-cyclization of the tautomeric hydrazone forms of the azides, and the absence of products that would be expected from nitrene intermediates suggests that the reactions proceed through a concerted mechanism.Evidence is presented to support the benzindazolone structures rather than the isomeric triazines.The ratios of O- and N-alkyl derivatives obtained on alkylation of 4a-d depend on the type of substituent in the arylamino ring and on the bulk of the alkyl group.

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