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4939-47-3

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4939-47-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 4939-47-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,3 and 9 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 4939-47:
(6*4)+(5*9)+(4*3)+(3*9)+(2*4)+(1*7)=123
123 % 10 = 3
So 4939-47-3 is a valid CAS Registry Number.

4939-47-3Downstream Products

4939-47-3Relevant articles and documents

Ynamide-Mediated Intermolecular Esterification

Wang, Xuewei,Yang, Yang,Zhao, Yongli,Wang, Sheng,Hu, Wenchang,Li, Jinmei,Wang, Zihao,Yang, Fengling,Zhao, Junfeng

, p. 6188 - 6194 (2020/05/26)

An ynamide-mediated one-pot, two-step intermolecular esterification via the condensation of carboxylic acids with nucleophilic hydroxyl species was reported. A broad substrate scope with respect to carboxylic acids, alcohols, and phenols was observed. The α-acyloxyenamide intermediates formed by the addition of carboxylic acids to ynamides proved to be effective acylating reagents for the esterification of alcohol and phenol derivatives with the assistance of base catalysis. Notably, the racemization of the α-chiral center of carboxylic acids can be avoided.

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