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39728-43-3

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39728-43-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 39728-43-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,7,2 and 8 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 39728-43:
(7*3)+(6*9)+(5*7)+(4*2)+(3*8)+(2*4)+(1*3)=153
153 % 10 = 3
So 39728-43-3 is a valid CAS Registry Number.

39728-43-3Relevant articles and documents

2,6-Dimethyl-4-nitrobenzoic anhydride (DMNBA): An effective coupling reagent for the synthesis of carboxylic esters and lactones

Shiina, Isamu,Miyao, Ryo

experimental part, p. 1313 - 1328 (2009/07/05)

Various carboxylic esters are obtained at room temperature in excellent yields with high chemoselectivities from nearly equimolar amounts of carboxylic acids and alcohols using 2,6-dimethyl-4-nitrobenzoic anhydride with triethylamine by the promotion of 4-(dimethylamino)pyridine. The efficiency of the esterification is compared to those of other dehydrations using substituted benzoic anhydrides as coupling reagents. This method was successfully applied to the synthesis of threo-aleuritic acid lactone and the desired 17-membered ring compound was prepared in high yield at room temperature from the corresponding free trihydroxycarboxylic acid using 2,6-dimethyl-4-nitrobenzoic anhydride in the presence of 4-(dimethylamino)pyridine.

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