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20488-38-4

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20488-38-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20488-38-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,4,8 and 8 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 20488-38:
(7*2)+(6*0)+(5*4)+(4*8)+(3*8)+(2*3)+(1*8)=104
104 % 10 = 4
So 20488-38-4 is a valid CAS Registry Number.

20488-38-4Relevant articles and documents

Aryl Pyrazoles from Photocatalytic Cycloadditions of Arenediazonium

Cardinale, Luana,Neumeier, Michael,Majek, Michal,Jacobi Von Wangelin, Axel

supporting information, p. 7219 - 7224 (2020/10/02)

A photocatalytic synthesis of 1,5-diaryl pyrazoles from arenediazoniums and arylcyclopropanols is reported. The reaction proceeded under mild conditions (rt, 20 min) with catalytic [Ru(bpy)3]2+ under blue-light irradiation and exhibited compatibility with several functional groups (e.g., I, SF5, SO2NH2, N3, CN) and perfect levels of regiocontrol. Mechanistic studies (luminescence spectroscopy, CV, DFT, radical trapping, quantum yield determination) documented an initial oxidative quenching of the excited photocatalyst and the operation of a radical-chain mechanism.

Shaken, not stirred: a schools test for aldehydes and ketones

Plater, M John

, p. 104 - 107 (2019/11/22)

A schools test for aldehydes and ketones in water at room temperature using test tubes has been developed in this laboratory using either phenylhydrazine hydrochloride or phenylhydrazine hydrochloride with NaOAc . 3H2O. The role of one equivalent of a strong or weak acid which catalyses the reaction is discussed.

Oxidized single-walled carbon nanotubes (swcns-cooh) as a new catalyst for the protection of carbonyl groups as hydrazones

Borazjani, Maryam Kiani,Safaei, Hamid Reza,Panahandeh, Majid,Kiani, Ali Reza,Kiani, Masoumeh,Mofarahi, Masoud

, p. 279 - 281 (2013/12/04)

Nano-materials are considered as suitable heterogeneous catalysts for many organic reactions. Herein oxidized carbon nanotube (SWCNTs-COOH) has been reported as a heterogeneous catalyst, for protection of carbonyl groups as hydrazones in EtOH at 80 C. The reactions proceed smoothly with good to excellent yields, and the SWCNTs-COOH used can be recycled.

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