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82902-47-4

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82902-47-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 82902-47-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,9,0 and 2 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 82902-47:
(7*8)+(6*2)+(5*9)+(4*0)+(3*2)+(2*4)+(1*7)=134
134 % 10 = 4
So 82902-47-4 is a valid CAS Registry Number.

82902-47-4Downstream Products

82902-47-4Relevant articles and documents

Regioselective Addition of Grignard Reagents to 1-Acylpyridinium Salts. A Convenient Method for the Synthesis of 4-Alkyl(aryl)pyridines

Comins, Daniel L.,Abdullah, Abdul H.

, p. 4315 - 4319 (2007/10/02)

The addition of Grignard reagents to 1-acylpyridinium salts afforded 1-acyl-2-alkyl(aryl)-1,2-dihydropyridines and 1-acyl-4-alkyl(aryl)-1,4-dihydropyridines.The regioselectivity of this reaction, 1,2- vs. 1,4-addition, was examined and found to be dependent upon the structures of the Grignard reagent and the 1-acyl group.Pyridine, 2-picoline, and 3-picoline were studied, and in most cases, significant amounts of 1,4-addition occurred.When a catalytic amount of cuprous iodide was present, nearly exclusive 1,4-addition resulted.The crude 1,4-dihydropyridines were aromatized by heating with sulfur to provide 4-substituted pyridines and picolines in good yield and high isomeric purity.

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