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90670-14-7

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90670-14-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 90670-14-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,6,7 and 0 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 90670-14:
(7*9)+(6*0)+(5*6)+(4*7)+(3*0)+(2*1)+(1*4)=127
127 % 10 = 7
So 90670-14-7 is a valid CAS Registry Number.

90670-14-7Relevant 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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