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90408-94-9

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90408-94-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 90408-94-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,4,0 and 8 respectively; the second part has 2 digits, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 90408-94:
(7*9)+(6*0)+(5*4)+(4*0)+(3*8)+(2*9)+(1*4)=129
129 % 10 = 9
So 90408-94-9 is a valid CAS Registry Number.

90408-94-9Relevant articles and documents

Preparation and Properties of Substituted 6&β-Vinylpenicillanic Acids

Foulds, Christopher D.,Jaxa-Chamiec, Albert A.,O'Sullivan, Anthony C.,Sammes, Peter G.

, p. 21 - 28 (2007/10/02)

Routes to the title compounds are described, either using the selective addition of thiols to the known 6-allylidenepenicillanic acids or by the conjugate addition of Grignard derivatives, derived from 6,6-dibromopenicillanates, to substituted acrylates and acrylamides, followed by stereoselective reduction of the remaining 6-bromo-group to produce the 6β-substituted penicillanates.The 6β-derivatives containing the acryloyl side-chain were relatively unstable and readily underwent intramolecular rearrangement to the corresponding thiazepinones.

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