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238421-81-3

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238421-81-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 238421-81-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,3,8,4,2 and 1 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 238421-81:
(8*2)+(7*3)+(6*8)+(5*4)+(4*2)+(3*1)+(2*8)+(1*1)=133
133 % 10 = 3
So 238421-81-3 is a valid CAS Registry Number.

238421-81-3Relevant articles and documents

2(3H)-and 2(5H)-furanones. VII. Chirality transfer on the tetronic acid templates

Momose, Takefumi,Toyooka, Naoki,Nishio, Morihiro,Shinoda, Hiroyuki,Fujii, Hiromi,Yanagino, Hironobu

, p. 1321 - 1343 (2007/10/03)

The chirality transfer on the β-tetronic acid templates has been examined via highly diastereoselective alkylation or the Michael reaction at the α-position of the acids. Synthetic utility of this transfer procedure was demonstrated by the formal synthesis of (+)-cassiol and enantiodivergent synthesis of O-methyljoubertiamine.

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