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25251-55-2

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25251-55-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 25251-55-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,2,5 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 25251-55:
(7*2)+(6*5)+(5*2)+(4*5)+(3*1)+(2*5)+(1*5)=92
92 % 10 = 2
So 25251-55-2 is a valid CAS Registry Number.

25251-55-2Downstream Products

25251-55-2Relevant articles and documents

para-Selective C?H Borylation of Aromatic Quaternary Ammonium and Phosphonium Salts

Chen, Yu,Deng, Zhangming,Liang, Yong,Lu, Shuo,Ma, Jiawei,Qin, Shengmeng,Zheng, Tianyu

supporting information, (2022/03/31)

Aromatic ammonium and phosphonium salts are important synthetic intermediates and multifunctional materials, but para-selective functionalization of the aromatic salts remains a challenge. Here we develop an ionic ligand based on our newly designed “biphenyl-phenanthroline” skeleton and realize the Ir-catalyzed para-selective C?H borylation of seven types of aromatic quaternary ammonium and phosphonium salts. Gram-scale transformation, late-stage elaboration for drug molecule, and diversification of borylated products demonstrate the potential utility of this reaction. The mechanistic studies and computational analysis elucidate the origin of para-selectivity.

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