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69471-43-8

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69471-43-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 69471-43-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,4,7 and 1 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 69471-43:
(7*6)+(6*9)+(5*4)+(4*7)+(3*1)+(2*4)+(1*3)=158
158 % 10 = 8
So 69471-43-8 is a valid CAS Registry Number.

69471-43-8Relevant articles and documents

Reaction of 6-Methylsulfonylpurine Riboside with Carbon Nucleophiles and the Synthesis of 6-Alkylpurine Nucleosides. (Nucleosides and Nucleotides. XXIX)

Yamane, Akira,Matsuda, Akira,Ueda, Tohru

, p. 150 - 156 (2007/10/02)

Treatment of 6-methylsulfonyl-9-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)purine with ethyl acetoacetate and sodium hydride in tetrahydrofuran afforded, after deblocking, 6-ethoxycarbonylmethyl-9-β-D-ribofuranosylpurine.Similarly, replacement of the 6-methylsulfonyl moiety with other carbanions derived from diethyl malonate, ethyl cyanoacetate, malononitrile, nitromethane, and sodium cyanide gave the corresponding 6-C-substituted purine nucleosides.Most of these derivatives exist as the 6-(1H)-exomethylene tautomeric forms. 6-Ethoxycarbonylmethylpurine riboside was further converted to 6-methyl, ethyl, propyl, butyl, and pentyl-purine ribosides by decarboxylation or prior alkylation of the methylene group followed by de-carboxylation.This reaction sequence facilitated the preparation of hitherto almost inaccessible alkyl or C-substituted purine nucleosides.Keywords- nucleophilic aromatic substitution; carbon nucleophiles; purine nucleosides; UV; NMR; tautomerism

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