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343798-56-1

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343798-56-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 343798-56-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,3,7,9 and 8 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 343798-56:
(8*3)+(7*4)+(6*3)+(5*7)+(4*9)+(3*8)+(2*5)+(1*6)=181
181 % 10 = 1
So 343798-56-1 is a valid CAS Registry Number.

343798-56-1Downstream Products

343798-56-1Relevant articles and documents

Nickel catalysed carbonylative Sonogashira reaction for the synthesis of diarylalkynones and 2-substituted flavones

Charugandla, Renuka,Vangala, Markandeya Sarma,Chidara, Sridhar,Korupolu, Raghu Babu

supporting information, p. 3283 - 3287 (2018/07/25)

The nickel catalyzed, palladium/phosphine free carbonylative Sonogashira reaction of terminal alkynes with substituted aryl and heteroaryl iodides is described. This protocol provides mild and robust conditions to synthesize a variety of substituted aryl α,β-alkynyl ketones and flavones in good to excellent isolated yields. This methodology tolerates several functional groups such as electron donating (methyl, isopropyl, tert-butyl, methoxy) as well as electron withdrawing (trifluoromethyl, nitro, esters, nitrile) groups on the terminal alkynes and iodides.

Oxidation of aromatic compounds: VII oxidation of symmetrically substituted 1,3-diarylpropynones in the system CF3COOH-CH2Cl2-PbO2. New synthesis method of 1,1,2,2-tetraaroylethenes

Vasil'ev,Rudenko,Grinenko

, p. 1157 - 1162 (2007/10/03)

Preparative oxidation of 1,3-diarypropynones ArC≡CCOAr in a system CF3COOH-CH2Cl2-PbO2 at 18-20°C within 1.5-25 h results in 1,1,2,2-tetraaroylethenes (ArCO)2C= C(COAr)2 in yields up to 75%. The most easily and efficiently the products form from the substrates where the aryl moiety conjugated with the triple bond contains electron-donating substituents p-MeO, p-Me, and p-t-Bu. On heating with hydrazine 1,1,2,2-tetrakis(4-methoxyphenylcarbonyl)ethene is converted into heterocyclic structures: pyridazine and 2,3,6,7-tetraazanaphthalene derivatives.

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