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172491-36-0

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172491-36-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 172491-36-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,4,9 and 1 respectively; the second part has 2 digits, 3 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 172491-36:
(8*1)+(7*7)+(6*2)+(5*4)+(4*9)+(3*1)+(2*3)+(1*6)=140
140 % 10 = 0
So 172491-36-0 is a valid CAS Registry Number.

172491-36-0Downstream Products

172491-36-0Relevant articles and documents

Convergent synthesis of vitamin D3 metabolites. Control of the stereoselectivity in samarium-induced cyclopropanations of cyclopentenes

Kabat,Kiegiel,Cohen,Toth,Wovkulich,Uskokovic

, p. 118 - 124 (2007/10/03)

The 25-hydroxy and 1α,25-dihydroxy vitamin D3 metabolites are obtained by solvolytic rearrangements of the 1-desoxy and 1α-hydroxy cyclopropyl vinylogous alcohols 31 and 29, respectively, with simultaneous formation of the vitamin D structural triene and the 3-hydroxy function. Two complementary methods have been employed to direct the stereoselectivity of the samarium induced olefin cyclopropanations which ultimately lead to key chiral ring A precursors. One protocol uses the two stereogenic centers of the (R,R)-2,3-butanediol ketal moiety of 8, while the other method uses the allylic hydroxyl group of (R)-16.

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