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439291-57-3

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439291-57-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 439291-57-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,9,2,9 and 1 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 439291-57:
(8*4)+(7*3)+(6*9)+(5*2)+(4*9)+(3*1)+(2*5)+(1*7)=173
173 % 10 = 3
So 439291-57-3 is a valid CAS Registry Number.

439291-57-3Relevant articles and documents

Dual role of ethyl bromodifluoroacetate in the formation of fluorine-containing heteroaromatic compounds

Ma, Xingxing,Mai, Shaoyu,Zhou, Yao,Cheng, Gui-Juan,Song, Qiuling

, p. 8960 - 8963 (2018)

An efficient one-pot cascade process via unprecedented quadruple cleavage of BrCF2COOEt with primary amines to afford valuable fluorine-containing heterocycles is described, in which BrCF2COOEt plays a dual role as a C1 synthon and a difluoroalkylating reagent for the first time. Mechanistic studies supported by DFT calculations suggest that a base plays an active role in the formation of the key intermediate isocyanides generated in situ from primary amines and difluorocarbene.

Sodium Sulfite-Involved Photocatalytic Radical Cascade Cyclization of 2-Isocyanoaryl Thioethers: Access to 2-CF2/CF3-Containing Benzothiazoles

Yuan, Yao,Dong, Wuheng,Gao, Xiaoshuang,Xie, Xiaomin,Zhang, Zhaoguo

supporting information, p. 469 - 472 (2019/01/11)

A visible-light-induced radical cascade cyclization of 2-isocyanoaryl thioethers for the synthesis of 2-CF2/CF3-containing benzothiazoles has been developed. Sodium sulfite can participate in the photocatalytic cycle as a reductant that efficiently transforms Ir4+ into Ir3+ to promote the fluoroalkylation under mild reaction conditions.

Visible light photocatalytic synthesis of benzothiophenes

Hari, Durga Prasad,Hering, Thea,Koenig, Burkhard

, p. 5334 - 5337,4 (2012/12/12)

The photocatalytic reaction of o-methylthio-arenediazonium salts with alkynes yields substituted benzothiophenes regioselectively through a radical annulation process. Green light irradiation of eosin Y initiates the photoredox catalysis. The scope of the reaction was investigated by using various substituted diazonium salts and different alkynes.

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