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203190-41-4

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203190-41-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 203190-41-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,1,9 and 0 respectively; the second part has 2 digits, 4 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 203190-41:
(8*2)+(7*0)+(6*3)+(5*1)+(4*9)+(3*0)+(2*4)+(1*1)=84
84 % 10 = 4
So 203190-41-4 is a valid CAS Registry Number.

203190-41-4Relevant articles and documents

A novel synthesis of enantiopure octahydropyrrolo[3,4-b]pyrroles by intramolecular [3 + 2] dipolar cycloaddition on chiral perhydro-1,3-benzoxazines

Pedrosa, Rafael,Andres, Celia,De Las Heras, Laura,Nieto, Javier

, p. 2513 - 2516 (2007/10/03)

(Matrix presented) Condensation of N-substituted glycines with chiral 3-allyl-2-formyl perhydro-1,3-benzoxazines forms an azomethine ylide that cyclizes to give octahydropyrrolo[3,4-b]pyrrole derivatives. The [3 + 2] dipolar cycloadditions are stereoespec

Unexpected stereoselective 6-exo versus 7-endo aryl radical cyclisation controlled by positional isomers in a chiral octahydro-1,3-benzoxazine moiety

Andrés, Celia,Duque-Soladana, Juan P.,Iglesias, Jesús M.,Pedrosa, Rafael

, p. 1391 - 1392 (2007/10/03)

Chiral perhydro-1,3-benzoxazines which carry both olefinic and bromo-aromatic substituents undergo stereo- and regio- radical cyclisations mediated by Bu3SnH. Diastereomeric six-membered and seven-membered rings are formed in positional isomers through selective 6-exo and 7-endo attack respectively.

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