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640997-22-4

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640997-22-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 640997-22-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,0,9,9 and 7 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 640997-22:
(8*6)+(7*4)+(6*0)+(5*9)+(4*9)+(3*7)+(2*2)+(1*2)=184
184 % 10 = 4
So 640997-22-4 is a valid CAS Registry Number.

640997-22-4Relevant articles and documents

Asymmetric synthesis of stagonolide-D and stagonolide-G

Mahapatra, Tridib,Das, Tapas,Nanda, Samik

, p. 511 - 519 (2011)

First asymmetric synthesis of the naturally occurring epoxy noneolide stagonolide-D has been reported in this article. Ring-closing metathesis (RCM) by Grubbs second generation catalyst, Sharpless asymmetric epoxidation (SAE), and cis-selective HornerWads

A PROCESS FOR OPTICAL PURE (R)-2-PHENOXYPROPIONIC ACID DERIVATIVES

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Page/Page column 8-9, (2008/06/13)

The present invention relates to a method for manufacturing optically active (R)-2-phenoxypropionic acid derivatives. More particularly, the present invention relates to a method for manufacturing optically active (R)-2-phenoxypropionic acid derivatives with high purity by using p-substituted phenol derivatives and alkyl (S)-2-arylsulfonyloxypropionate as starting materials and reacting them at 60 to 100 °C in the presence of an alkalimetal salt as a base and. a hydrocarbon solvent.

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