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128947-68-2

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128947-68-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128947-68-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,9,4 and 7 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 128947-68:
(8*1)+(7*2)+(6*8)+(5*9)+(4*4)+(3*7)+(2*6)+(1*8)=172
172 % 10 = 2
So 128947-68-2 is a valid CAS Registry Number.

128947-68-2Relevant articles and documents

1,6-Anhydro-1-thio-β-D-glucopyranose (thiolevoglucosan) and the corresponding sulfoxides and sulfone

Budesinsky, Milos,Polakova, Jana,Hamernikova, Michaela,Cisarova, Ivana,Trnka, Tomas,Cerny, Miloslav

, p. 311 - 336 (2007/10/03)

Starting 1,2,3,4-tetra-O-acetyl-6-O-tosyl-β-D-glucopyranose (3) was converted into 2,3,4-tri-O-acetyl-1-thio-6-O-tosyl-β-D-glucopyranose (6) via intermediate glycosyl bromide 4 and S-thiouronium salt 5. Treatment of compound 6 with sodium methoxide gave 1,6-anhydro-1-thio-β-D-glucopyranose (thiolevoglucosan 2a). The isomeric sulfoxides 7 and 8 were prepared by selective oxidation of thiolevoglucosan 2a with hydrogen peroxide or 3-chloroperoxybenzoic acid. The structure of new compounds was confirmed by 1H and 13C NMR spectroscopy or by X-ray analysis; magnetic anisotropy of the sulfinyl and sulfonyl group has been discussed.

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