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143143-52-6

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143143-52-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 143143-52-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,1,4 and 3 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 143143-52:
(8*1)+(7*4)+(6*3)+(5*1)+(4*4)+(3*3)+(2*5)+(1*2)=96
96 % 10 = 6
So 143143-52-6 is a valid CAS Registry Number.

143143-52-6Downstream Products

143143-52-6Relevant articles and documents

3-Azabicyclic Ketones from 1,3-Dialkoxy-2-azapropenylium Salts and Enamines of Cyclic Ketones

Schleimer, Richard,Hornig, Knut,Moeller, Manfred H.,Wuerthwein, Ernst-Ulrich

, p. 133 - 142 (2007/10/02)

1,3-Diethoxy-2-azapropenylium salts 1 are powerful biselectrophiles and react diastereoselectively with enamines of five-membered ring ketones 2 to yield novel 3-azabicyclooct-2-en-8-ones 5 after hydrolysis of the intermediate iminium salts 3, 4.Some of the iminium salts 3 can be hydrolyzed further to provide the diketo imines 6.With enamines of six-membered ring ketones 7 the 3-azabicyclonon-2-en-9-ones 10, 11 are obtained after hydrolytic workup.Mixtures of diastereomers 10/11 are found in the case of 7a,b, whereas with 7g-j the endo-phenyl derivatives 10 are formed exclusively.With the unsymmetrical enamine 7b only one regioisomer is observed.The decalone enamine 12 reacts with 1a to yield the tricyclic iminium salt 13. - The configuration of the bicyclic products has been determined by using NMR spectroscopic techniques (COSY, polarisation transfer by long range couplings); an X-ray analysis of compound 10a is used as basis for the NMR assignments.General rules for the determination of the stereochemistry of these azabicyclic systems by 1H-NMR shift arguments are derived. Key Words: 2-Azapropenylium salts / Enamines / 3-Azabicyclooct-2-en-8-ones / 3-Azabicyclonon-2-en-9-ones / Stereochemistry

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