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104481-00-7

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104481-00-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 104481-00-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,4,4,8 and 1 respectively; the second part has 2 digits, 0 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 104481-00:
(8*1)+(7*0)+(6*4)+(5*4)+(4*8)+(3*1)+(2*0)+(1*0)=87
87 % 10 = 7
So 104481-00-7 is a valid CAS Registry Number.

104481-00-7Relevant articles and documents

Studies of the selective O-alkylation and dealkylation of flavonoids. XVIII. A convenient method for synthesizing 3,5,6,7-tetrahydroxyflavones

Horie,Kobayashi,Kawamura,Yoshida,Tominaga,Yamashita

, p. 2033 - 2041 (1995)

In the demethylation of 6-hydroxy-3,4',7-trimethoxy-5-(tosyloxy)flavone with anhydrous aluminum bromide, the 5-tosyloxyl group was eliminated with bromination to give 8-bromo-3,6,7-trihydroxy-4'-methoxyflavone as the main product. When anhydrous aluminum chloride was used in the demethylation of the acetate, the 5-tosyloxyl group was cleaved prior to the demethylation to give 5,6,7-trihydroxy-3,4'-dimethoxyflavone. Demethylation of 6-hydroxy-4',5,7-trimethoxy-3-(tosyloxy)flavone and its acetate with the bromide or chloride afforded the 5,6,7-trihydroxyflavone without the cleavage of the 3-tosyloxyl group, but was not suitable for the general synthesis of the 3,5,6,7-tetrahydroxyflavones because of the difficulty in removing the protecting group. Consequently, it was found that the direct demethylation of 3,6-dihydroxy-5,7-dimethoxyflavones with anhydrous aluminum chloride-sodium iodide in acetonitrile was the most useful general method for synthesizing 3,5,6,7-tetrahydroxyflavones. Additionally, the reported structures of two natural flavones were revised.

Studies of the selective O-alkylation and dealkylation of flavonoids. VIII. Synthesis of pedaliin

Horie,Tsukayama,Kourai,et al.

, p. 30 - 35 (2007/10/02)

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