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73809-41-3

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73809-41-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 73809-41-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,8,0 and 9 respectively; the second part has 2 digits, 4 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 73809-41:
(7*7)+(6*3)+(5*8)+(4*0)+(3*9)+(2*4)+(1*1)=143
143 % 10 = 3
So 73809-41-3 is a valid CAS Registry Number.

73809-41-3Relevant articles and documents

Synthesis, conformational analysis, and biological-activity of the 1-α,25-dihydroxy-10,19-dihydrovitamin D3 isomers

Sicinski,Deluca

, p. 150 - 171 (2007/10/02)

The synthesis of the four 1α,25-dihydroxy-10,19-dihydrovitamin D3 stereoisomers (8-11) is described starting from 25-hydroxyvitamin D3(1c). Acetic acid-catalyzed cycloreversion of 1 α-hydroxylated 3,5-cyclovitamin D compound 14, prod

Direct C(1) Hydroxylation of Vitamin D3 and Related Compounds

Paaren, Herbert E.,DeLuca, Hector F.,Schnoes, Heinrich K.

, p. 3253 - 3258 (2007/10/02)

A direct synthesis of C(1) hydroxylated vitamin D analogues from the corresponding vitamin D precursors has been developed.Allylic oxidation of 3,5-cyclovitamin D derivatives, readily obtained from the buffered solvolysis of vitamin D tosylates, with selenium dioxide yields 1α-hydroxylated 3,5-cyclovitamin D compounds which are smoothly converted to the desired 1α-hydroxyvitamin D derivatives by acid-catalyzed cycloreversion.Application of this scheme to vitamin D3 (1a), 25-hydroxyvitamin D3 (1b), and vitamin D2 (1c) affords the 1α-hydroxy products in ca.20 percent overall yield.

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