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164199-89-7

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164199-89-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 164199-89-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,4,1,9 and 9 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 164199-89:
(8*1)+(7*6)+(6*4)+(5*1)+(4*9)+(3*9)+(2*8)+(1*9)=167
167 % 10 = 7
So 164199-89-7 is a valid CAS Registry Number.

164199-89-7Relevant articles and documents

Synthetic potential inherent in D-isoascorbic acid as a precursor for pyridazine and furo[3,2-c]pyridazine ring systems with two asymmetric centers

El Ashry,Awad,Abdel Hamid,El Kilany

, p. 1061 - 1067 (2007/10/03)

Reaction of D-erythro-2,3-hexodiulosono-1,4-lactone-2,3-bis(phenylhydrazone) (2) with an iodine, triphenylphosphine and imidazole mixture afforded the furo[3,2-c]pyridazine derivative 11. Condensation of 6-bromo-6-deoxy-D-erythro-2,3-hexodiulosono-1,4-lactone with phenylhydrazine gave the bishydrazones 6, and 8 or the furo[3,2-c]pyridazine (11) depending on the reaction conditions. The lactone ring in 11 could be opened by treatment with alkali to give the pyridazine derivative 9. Lactonization of the later with simultaneous acetylation by acetic anhydride afforded the lactone derivative 14. Alkali treatment of 6 gave the pyrazolindione derivative 13 that gave upon reation with HBr/AcOH the dibromide 15. The assigned structures were based on spectral analysis. The activity of compounds 11 and 14 against hepatitis B virus has been studied.

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