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646039-18-1

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646039-18-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 646039-18-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,6,0,3 and 9 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 646039-18:
(8*6)+(7*4)+(6*6)+(5*0)+(4*3)+(3*9)+(2*1)+(1*8)=161
161 % 10 = 1
So 646039-18-1 is a valid CAS Registry Number.

646039-18-1Relevant articles and documents

Synthesis of Quinolines and 2H-Dihydropyrroles by Nucleophilic Substitution at the Nitrogen Atom of Oxime Derivatives

Kitamura, Mitsuru,Yoshida, Masayuki,Kikuchi, Takashi,Narasaka, Koichi

, p. 2415 - 2426 (2007/10/03)

Isomerization of oxime derivatives was researched in detail to find out the methods for the syn-anti isomerization of O-substituted oximes. Based on these findings were developed simple methods for the preparation of aza-heterocycles from both stereoisomers of oximes. Quinolines were synthesized from β-aryl ketone oximes by treatment with trifluoroacetic anhydride and 4-chloranil. γ,δ-Unsaturated O-methoxyacetyloximes were transformed to 2H-dihydropyrroles by reaction with methoxy-acetic acid.

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