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21104-36-9

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21104-36-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21104-36-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,0 and 4 respectively; the second part has 2 digits, 3 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 21104-36:
(7*2)+(6*1)+(5*1)+(4*0)+(3*4)+(2*3)+(1*6)=49
49 % 10 = 9
So 21104-36-9 is a valid CAS Registry Number.

21104-36-9Relevant articles and documents

A new route to enantiomerically pure 4,4-disubstituted cyclohex-2-en-1-ones: Asymmetric synthesis of (+)-mesembrine

Kosugi,Miura,Kanna,Uda

, p. 1409 - 1412 (2007/10/02)

Enantiomerically pure β,β-disubstituted vinyl sulfoxides undergo cycloaddition with dichloroketene to give β,β-disubstituted γ-lactones which are transformed into synthetically important 4,4-disubstituted cyclohex-2-enones in optically pure form. The present method is applied to the synthesis of enantiomerically pure (+)-mesembrine.

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