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903570-37-6

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903570-37-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 903570-37-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,0,3,5,7 and 0 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 903570-37:
(8*9)+(7*0)+(6*3)+(5*5)+(4*7)+(3*0)+(2*3)+(1*7)=156
156 % 10 = 6
So 903570-37-6 is a valid CAS Registry Number.

903570-37-6Relevant articles and documents

2-(Phenylthio)ethyl as a novel two-stage base protecting group for thymidine analogues

D'Onofrio, Jennifer,De Napoli, Lorenzo,Di Fabio, Giovanni,Montesarchio, Daniela

, p. 845 - 848 (2007/10/03)

2-(Phenylthio)ethyl is here proposed for temporary masking the thymine residue in the synthesis of sugar modified thymidine derivatives. This protection has been devised as a 'two-stage' system. The 2-(phenylthio)ethyl residue can be easily and regiospecifically inserted at the N3-position of the pyrimidine by a Mitsunobu reaction with 2-(phenylthio)ethanol and is perfectly stable also to strongly basic conditions. This allowed us to selectively achieve O-alkylation of the ribose moieties in satisfactory yields, avoiding undesired base alkylations. After oxidation of the thioether to sulfone, the thymine protecting group can be totally removed, by a β-elimination mechanism, upon the same basic treatment required for the final deprotection and detachment of oligonucleotides from the support in solid-phase synthesis protocols. Georg Thieme Verlag Stuttgart.

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