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90920-51-7

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90920-51-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 90920-51-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,9,2 and 0 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 90920-51:
(7*9)+(6*0)+(5*9)+(4*2)+(3*0)+(2*5)+(1*1)=127
127 % 10 = 7
So 90920-51-7 is a valid CAS Registry Number.

90920-51-7Relevant articles and documents

Synthesis of New 1,2,3-Triazolo[1,2-a]benzotriazole Derivatives or Substituted 2,3-Benzo-13a,6,6a-tetraazapentalenes. II

Biagi, Giuliana,Giorgi, Irene,Livi, Oreste,Manera, Clementina,Scartoni, Valerio,Barili, Pier Luigi

, p. 845 - 851 (2007/10/03)

This paper continues the synthesis of new 1,2,3-triazolo[1,2-a]benzotriazoles or 2,3-benzo-1,3a,6,6a-tetrazapentalenes to submit to biological assays. The derivatives were obtained by deoxycyclization reactions of appropriate nitrophenyl-1,2,3-triazole derivatives and by thermal decomposition of appropriate azidophenyl-1,2,3-triazoles (Schemes 1 and 2). Some attempts to extend these synthetic routes to the preparation of 1,2,4-triazolo[1,2-a]benzotriazoles (Scheme 3) and 1,2,3-triazolo[1,2-b]-4H-1,2,3-benzo-triazines (Scheme 4) completely failed.

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