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196491-87-9

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196491-87-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 196491-87-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,6,4,9 and 1 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 196491-87:
(8*1)+(7*9)+(6*6)+(5*4)+(4*9)+(3*1)+(2*8)+(1*7)=189
189 % 10 = 9
So 196491-87-9 is a valid CAS Registry Number.

196491-87-9Relevant articles and documents

Desymmetrization of 3-dimethyl(phenyl)silyl glutaric anhydride with Evans' oxazolidinone: An application to stereocontrolled synthesis of the antifungal agent (+)-preussin

Verma, Rekha,Ghosh, Sunil K.

, p. 265 - 270 (2007/10/03)

A stereoselective total synthesis of (+)-preussin (1) has been achieved from the a-symmetric 3-dimethyI(phenyl)silyl substituted glutaric anhydride 4 featuring its desymmetrization using Evans' oxazolidinone 10. The first homochiral intermediate, the glutarate half-ester 9 was obtained from both the diastereoisomeric acids lia, and 12a in a convergent fashion. The dimethyl(phenyl)silyl group is not only acting as a masked hydroxy group but also restricts elimination reactions, and facilitates Curtius reaction. It also stereodirects ester enolate alkylation of 18, and hydrogenation of intermediate Δ1-pyrroline 5.

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