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139887-85-7

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139887-85-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 139887-85-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,8,8 and 7 respectively; the second part has 2 digits, 8 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 139887-85:
(8*1)+(7*3)+(6*9)+(5*8)+(4*8)+(3*7)+(2*8)+(1*5)=197
197 % 10 = 7
So 139887-85-7 is a valid CAS Registry Number.

139887-85-7Relevant articles and documents

Synthesis of Deoxydinucleoside Phosphates Containing 4-Thio Substituted Pyrimidine Nucleobases

Clivio, Pascale,Fourrey, Jean-Louis,Gasche, Jeanette,Favre, Alain

, p. 2383 - 2388 (2007/10/02)

The preparations, by the hydrogenphosphonate approach in solution, of the five pyrimidine deoxydinucleoside monophosphates 14a, 14b, 16a, 16b and 17 containing a 4-thiosubstituted pyrimidine nucleobase at either their 3'- or 5'-end are described.These syntheses were conveniently accomplished using 4-thionucleoside derivatives having their sulfur function protected by S-pivaloyloxymethylation.The behaviour of unprotected 4-thionucleoside derivatives was also investigated and they were shown to give comparable overall yields.

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