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191721-03-6

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191721-03-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 191721-03-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,1,7,2 and 1 respectively; the second part has 2 digits, 0 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 191721-03:
(8*1)+(7*9)+(6*1)+(5*7)+(4*2)+(3*1)+(2*0)+(1*3)=126
126 % 10 = 6
So 191721-03-6 is a valid CAS Registry Number.

191721-03-6Relevant articles and documents

Regio- and stereoselective synthesis of 3- and 5-(C-glycosyl)-4- nitroisoxazolidines by nitrone-nitroalkene [3+2] cycloaddition reactions

Borrachero, Pastora,Cabrera, Francisca,Dianez, Ma. Jesus,Estrada, Ma. Dolores,Gomez-Guillen, Manuel,Lopez-Castro, Amparo,Moreno, Jose Ma.,De Paz, Jose L.,Perez-Garrido, Simeon

, p. 77 - 98 (1999)

Cycloaddition reactions of nitrones, including sugar nitrones, with nitroalkenes, including sugar nitroolefins, led with complete regioselectivity and stereospecificity to 4,5-trans-4-nitroisoxazolidines in 51-78% global yields. The endo/exo stereoselectivity depends on the type of sugar derivative used. As expected, the best π-diastereofacial selectivity was observed when both partners were sugar derivatives. Isomerisation of the first formed diastereomers by the action of silica gel was observed in some cases. Absolute configurations for two crystalline products were assigned by X-ray diffraction methods.

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