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116544-54-8

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116544-54-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 116544-54-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,5,4 and 4 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 116544-54:
(8*1)+(7*1)+(6*6)+(5*5)+(4*4)+(3*4)+(2*5)+(1*4)=118
118 % 10 = 8
So 116544-54-8 is a valid CAS Registry Number.

116544-54-8Relevant articles and documents

Cyclodeshydratation d'aryloxy-2 diaryl-1,2 ethanones en diaryl-2,3 benzofurannes. Influence de la substitution sur la competition entre deux chemins reactionnels

Montfort, Bernard,Laude, Bernard,Vebrel, Joel,Cerutti, Ernest

, p. 848 - 854 (2007/10/02)

Many of the methods for synthesizing derivatives of 2,3-diaryl benzofurans imply cyclodehydration of 1,2-diaryl 2-aryloxyethanones, leading often to a mixture of two isomers which differ by the presence of the aryl substituent at positions C-2 or C-3 of benzofuran.This isomerisation is explained by a competition between two possible mechanisms.Either a direct electrophilic substitution or the intermediate formation of an α-acylcarbenium ion.This study deals with the competition as determined by the substitution of aryl groups in the initial substrate.Each 2,3-diarylbenzofuran was synthesized previously using an unambiguous method.

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