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17242-86-3

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17242-86-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 17242-86-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,2,4 and 2 respectively; the second part has 2 digits, 8 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 17242-86:
(7*1)+(6*7)+(5*2)+(4*4)+(3*2)+(2*8)+(1*6)=103
103 % 10 = 3
So 17242-86-3 is a valid CAS Registry Number.

17242-86-3Relevant articles and documents

Synthesis of O2,2′-cyclo-β-D-arabinofuranosyl- and β-D-arabinofuranosyl-5-fluorocytosine

Kvasyuk,Mikhailopulo,Barwolff,Cech

, p. 533 - 536 (2007/10/02)

Methods for the synthesis of 5-fluorocytosine by direct fluorination of cytidine tetraacetate with elementary fluorine in acetic acid and by amination of 5-fluorouridine triacetate by the action of sodium hydride and p-toluenesulfonyl chloride and subsequent ammonolysis were studied. 5-Fluorocytidine was converted to O2, 2′-cyclo-β-D-arabinofuranosyl-5-fluorocytosine by the successive action of acetylsalicylyl chloride and acetyl chloride in methanol to remove the protective groups. Removal of the protective groups by means of a methanol solution of ammonia gave β-D-arabinofuranosyl-5-fluorocytosine. The latter was also obtained by amination of β-D-arabinofuranosyl-5-fluorouracil tribenzoate.

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