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253316-02-8

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253316-02-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 253316-02-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,3,3,1 and 6 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 253316-02:
(8*2)+(7*5)+(6*3)+(5*3)+(4*1)+(3*6)+(2*0)+(1*2)=108
108 % 10 = 8
So 253316-02-8 is a valid CAS Registry Number.

253316-02-8Downstream Products

253316-02-8Relevant articles and documents

Preparation of racemic and enantiopure arenesulfonimidoyl azoles - New compounds chiral on sulfur

Kluge, Ralph,Hocke, Heiko,Schulz, Manfred,Schilke, Frank

, p. 179 - 206 (2007/10/03)

The novel arenesulfonimidoyl imidazoles 7a-j and nitrotriazoles 9d-j were obtained in good yield from the corresponding arenesulfonimidoyl chlorides 6a-j. The reaction of optically pure sulfonimidoyl chlorides 6 with imidazole resulted in the first reported optically active arenesulfonimidoyl imidazoles 7 with high enantiomeric purities (ee up to >99%); the stereochemical course of the reaction (inversion or retention at sulfur) is shown to be strongly dependent on the aryl substituent. By contrast, the analogous reaction of optically pure compounds 6 with 3-nitro-1,2,4-triazole led to racemic arenesulfonimidoyl nitrotriazoles 9. Optically active compounds of this type, (S)-9f (ee 99%) and (R)-9f (ee 92%), were obtained by semi-preparative chiral HPLC. The optically active arenesulfonimidoyl imidazolium salt (RS,RC)-8j was prepared by diastereoselective methylation (de >90%) of the optically pure imidazole derivative (RS,RC)-7j.

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