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197151-80-7

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197151-80-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 197151-80-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,1,5 and 1 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 197151-80:
(8*1)+(7*9)+(6*7)+(5*1)+(4*5)+(3*1)+(2*8)+(1*0)=157
157 % 10 = 7
So 197151-80-7 is a valid CAS Registry Number.

197151-80-7Relevant articles and documents

Efficient syntheses of pyrofolic acid and pteroyl azide, reagents for the production of carboxyl-differentiated derivatives of folic acid

Luo, Jin,Smith, Michael D.,Lantrip, Douglas A.,Wang, Susan,Fuchs

, p. 10004 - 10013 (1997)

Reaction of folic acid (1) with excess trifluoroacetic anhydride provides access to both the previously unknown N10-(trifluoroacetyl)pyrrofolic acid (8) and pyrofolic acid (9). Reaction of either of these materials with hydrazine selectively affords pteroyl hydrazide (13), which may be oxidized to pteroyl azide (27) on a large scale (62% overall from I without the need for chromatography). Treatment of 27 with differentially protected glutamates provides a convenient and high-yielding synthesis of differentially protected, optically pure folates.

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