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20089-18-3

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20089-18-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20089-18-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,0,8 and 9 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 20089-18:
(7*2)+(6*0)+(5*0)+(4*8)+(3*9)+(2*1)+(1*8)=83
83 % 10 = 3
So 20089-18-3 is a valid CAS Registry Number.

20089-18-3Relevant articles and documents

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Dangschat,Fischer

, p. 756 (1939)

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Dihydroxylation of polyenes using Narasaka's modification of the upjohn procedure

Gypser, Andreas,Michel, Dominique,Nirschl, David S.,Barry Sharpless

, p. 7322 - 7327 (2007/10/03)

Dihydroxylation of a variety of commercially available polyenes has been investigated using phenylboronic acid, .ZV-methylmorpholine Af-oxide (NMO), and osmium tetroxide in anhydrous solvent. The diastereoselectivity of multiple oxidation steps is in some cases affected by the in situ protection of the intermediate ene-diols as phenyboronic esters, affording polyols not available from the standard Upjohn dihydroxylation procedure. A convenient oxidative deprotection of the phenylboronic esters is also described.

Catalytic One-Pot Osmylation of Cyclohexadienes: Stereochemical and Conformational Studies of the Resulting Polyols

Tschamber, Theophile,Backenstrass, Frederique,Fritz, Hans,Streith, Jacques

, p. 1052 - 1060 (2007/10/02)

Catalytic double osmylation is described for a series of cyclohexadienes in acetone/H2O in the presence of the co-oxidant N-methylmorpholine N-oxide (NMO).The formation of polyols occurred stereospecifically with cyclohexadienes 3, 7, and 11a, leading thereby to tetrols 5a, and 9a and to allo-inositol (14a), respectively.To the contrary, trans-cyclohexadiene-diol 15a gave a mixture of the stereoisomeric inositols 18a (epi), 19a (neo), and 20a (chiro).High-field NMR let to clearcut conformational analyses of the polyhydroxylated derivatives.

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