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74669-41-3

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74669-41-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 74669-41-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,6,6 and 9 respectively; the second part has 2 digits, 4 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 74669-41:
(7*7)+(6*4)+(5*6)+(4*6)+(3*9)+(2*4)+(1*1)=163
163 % 10 = 3
So 74669-41-3 is a valid CAS Registry Number.

74669-41-3Downstream Products

74669-41-3Relevant articles and documents

Acylation of 4-Pyridone

Effenberger, Franz,Mueck, Alfred Otto,Bessey, Eberhard

, p. 2086 - 2099 (2007/10/02)

Only N-acyl-4-pyridones (5) are isolable from the acylation of 4-pyridone (1) with aliphatic carboxylic anhydrides, and chlorides or free acids in the presence of dicyclohexylcarbodiimide.Similarly the reaction of 1with ortho substituted derivatives of benzoic acid leads only to N-acylation products 8, while benzoyl chloride as well as benzoic acid derivatives 7i-s (meta or para substituted), 3,5-dinitrobenzoyl chloride, and the 2,4-dimethyl substituted benzoyl chlorides 7v-z give exclusively 4-(acyloxy)pyridines 9.Reaction of phthaloyl chloride (10) with 1 yields both N- and O-acylation products.In solution even at room temperature the N-acylation compounds 2 and 8 are in equilibrium with the (acyloxy)pyridines 3 and 9, respectively.The position of the equilibrium depends mainly on the structure of the acyl residue, it is, however, also effected by temperature and polarity of the solvent.

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