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71831-55-5

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71831-55-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 71831-55-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,8,3 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 71831-55:
(7*7)+(6*1)+(5*8)+(4*3)+(3*1)+(2*5)+(1*5)=125
125 % 10 = 5
So 71831-55-5 is a valid CAS Registry Number.

71831-55-5Upstream product

71831-55-5Relevant articles and documents

Synthetic Applications of N-N Linked Heterocycles. Part 8. Regiospecific Synthesis of 4-(α-Acylalkyl)pyridines by Attack of Lithium Enolates of Ketones γ to N-(2,6-Dimethyl-4-oxopyridin-1-yl)pyridinium Salts

Lee, Cheuk Man,Sammes, Michael P.,Katritzky, Alan R.

, p. 2458 - 2462 (2007/10/02)

The addition of N-(2,6-dimethyl-4-oxopyridin-1-yl)pyridinium salts (2) - (4) to lithium enolates (1) of ketones in tetrahydrofuran at low temperatures gives regiospecifically high yields of 1,4-dihydro-adducts (5) - (7).These are readily isolated and can be decomposed under free-radical conditions, also in high yield, to 4-(α-acylalkyl)pyridines (8) - (10).Unsymmetrical dialkyl ketones give a mixture of two isomeric products, the ratio depending upon reaction conditions and steric factors. αβ-Unsaturated ketones, however, give products resulting from reaction exclusively at the position α' to the carbonyl group.

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