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98540-26-2

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98540-26-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 98540-26-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,8,5,4 and 0 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 98540-26:
(7*9)+(6*8)+(5*5)+(4*4)+(3*0)+(2*2)+(1*6)=162
162 % 10 = 2
So 98540-26-2 is a valid CAS Registry Number.

98540-26-2Relevant articles and documents

An Oxidant- And Catalyst-Free Synthesis of Dibenzo[ a, c ]carbazoles via UV Light Irradiation of 2,3-Diphenyl-1 H -indoles

Hou, Rong,Kang, Yang,Liang, Yong,Min, Xiaoyan,Wang, Tao,Zhang, Zunting

, (2021/12/13)

An efficient methodology for the synthesis of dibenzo[a,c]- carbazoles via annulation of 2,3-diphenyl-1H-indoles in EtOH under UV light irradiation (λO = 365 nm) along with hydrogen evolution is described. This method exhibits the advantages of mild reaction conditions, no requirement of any oxidants and catalysts, and release of hydrogen as the only byproduct. Notably, the mechanism investigation confirms that the trans-4b,8a-dihydro-9H-dibenzo[a,c]carbazole intermediate could convert into cis-4b,8a-dihydro-9H-dibenzo[a,c]carbazole, which relies on the nitrogen atom of the indole ring. This is followed by intramolecular dehydrogenation which yields the dibenzo[a,c]carbazoles. 2021. Thieme. All rights reserved.

Synthesis of Functionalized Indolines and Dihydrobenzofurans by Iron and Copper Catalyzed Aryl C-N and C-O Bond Formation

Henry, Martyn C.,Senn, Hans Martin,Sutherland, Andrew

, p. 346 - 364 (2019/01/08)

A simple and effective one-pot, two-step intramolecular aryl C-N and C-O bond forming process for the preparation of a wide range of benzo-fused heterocyclic scaffolds using iron and copper catalysis is described. Activated aryl rings were subjected to a highly regioselective, iron(III) triflimide-catalyzed iodination, followed by a copper(I)-catalyzed intramolecular N-or O-arylation step leading to indolines, dihydrobenzofurans, and six-membered analogues. The general applicability and functional group tolerance of this method were exemplified by the total synthesis of the neolignan natural product, (+)-obtusafuran. DFT calculations using Fukui functions were also performed, providing a molecular orbital rationale for the highly regioselective arene iodination process.

Asymmetric synthesis of corsifuran A by an enantioselective oxazaborolidine reduction

Adams, Harry,Gilmore, Nathan J.,Jones, Simon,Muldowney, Mark P.,Von Reuss, Stephan H.,Vemula, Ramesh

supporting information; experimental part, p. 1457 - 1460 (2009/04/10)

(Chemical Equation Presented) Corsifuran A has been prepared in an enantiomerically pure form for the first time by an asymmetric reduction procedure, allowing confirmation of the absolute stereochemistry of the natural product as (R).

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