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13657-44-8

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13657-44-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 13657-44-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,6,5 and 7 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 13657-44:
(7*1)+(6*3)+(5*6)+(4*5)+(3*7)+(2*4)+(1*4)=108
108 % 10 = 8
So 13657-44-8 is a valid CAS Registry Number.

13657-44-8Relevant articles and documents

Electroorganic Chemistry. 62. Reaction of Iminium Ion with Nuclophile: A Versatile Synthesis of Tetrahydroquinolines and Julolidines

Shono, Tatsuya,Matsumura, Yoshihiro,Inoue, Kenji,Ohmizu, Hiroshi,Kashimura, Shigenori

, p. 5753 - 5757 (2007/10/02)

A versatile synthetic method of tetrahydroquinolines and julolidines has been developed.The method involves the anodic oxidation of N,N-dimethylaniline in methanol to afford α-methoxylated or α,α'-dimethoxylated compounds and subsequent treatment of the products with Lewis acids in the presence of nucleophiles.Simple and electron-rich olefins such as alkenes, styrene, enol ethers, silyl enol ethers, enamines, and enol esters are usable as the nucleophiles.The intermediary formation of iminium ions from the methoxylated compounds is proposed as one of the key steps.The nucleophilic reaction od Grignard reagents with the methoxylated compounds in the presence of Lewis acid is also described.

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