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21724-88-9

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21724-88-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21724-88-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,2 and 4 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21724-88:
(7*2)+(6*1)+(5*7)+(4*2)+(3*4)+(2*8)+(1*8)=99
99 % 10 = 9
So 21724-88-9 is a valid CAS Registry Number.

21724-88-9Downstream Products

21724-88-9Relevant articles and documents

Palladium-catalyzed aerobic oxidative carbonylation of alkynes with amines: a general access to substituted maleimides

Yang, Ji,Liu, Jiawang,Jackstell, Ralf,Beller, Matthias

supporting information, p. 10710 - 10713 (2018/09/29)

A catalytic oxidative carbonylation reaction was developed for the synthesis of polysubstituted maleimides from alkynes and amines with air as a green oxidant. This novel transformation proceeds in the presence of palladium chloride without the need for expensive ligands or additives and has a broad substrate scope affording a variety of maleimides in good to high yields.

Cu/Ag-Cocatalyzed Aerobic Oxidative Amination and CuCl2-Mediated Aerobic Oxidative Chloroamination of Maleimides

An, Yu-Long,Zhang, He-Hui,Yang, Zhen-Hua,Lin, Long,Zhao, Sheng-Yin

supporting information, p. 5405 - 5414 (2016/11/22)

An efficient Cu(OAc)2/Ag2CO3-cocatalyzed approach for the synthesis of 3-aminomaleimides and 3-amino-4-indolylmaleimides has been developed with satisfactory yields. A series of primary and secondary amines are compatible with this reaction. In addition, treatment of maleimides with primary amines using 1 equiv. of CuCl2leads to the formation of chloroamination products such as 3-amino-4-chloromaleimides by a radical-type mechanism.

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