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344440-96-6

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344440-96-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 344440-96-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,4,4,4 and 0 respectively; the second part has 2 digits, 9 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 344440-96:
(8*3)+(7*4)+(6*4)+(5*4)+(4*4)+(3*0)+(2*9)+(1*6)=136
136 % 10 = 6
So 344440-96-6 is a valid CAS Registry Number.

344440-96-6Relevant articles and documents

Michael Reaction of Conjugated Nitro Olefins with Carboxylic Acid Dianions and with Ester Enolates: New Synthesis of γ-Keto Acids and γ-Keto Esters

Miyashita, Masaaki,Yamaguchi, Ryuji,Yoshikoshi, Akira

, p. 2857 - 2863 (2007/10/02)

Base-sensitive conjugated nitro olefins 2 reacted with lithium dianions of carboxylic acids 3 or with lithium enolates of esters 4 at a low temperature of ca. -100 deg C, and subsequent treatment of the Michael adducts with aqueous acid yielded γ-keto acids 5 or esters 5' in a one-pot operation, respectively.Results of both the reactions have been compared.Some applications of the resulting γ-keto esters in organic synthesis have also been demonstrated in lactone synthesis and cyclenone annulation.

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