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56119-91-6

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56119-91-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 56119-91-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,6,1,1 and 9 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 56119-91:
(7*5)+(6*6)+(5*1)+(4*1)+(3*9)+(2*9)+(1*1)=126
126 % 10 = 6
So 56119-91-6 is a valid CAS Registry Number.

56119-91-6Relevant articles and documents

Preparation method for pyrazole

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Paragraph 0011; 0012; 0013; 0014; 0015; 0016; 0095; 0096, (2017/08/26)

The invention relates to a preparation method for pyrazole, belonging to the field of organic chemistry. The preparation method disclosed in the invention realizes preparation of pyrazole through a cyclization reaction of N-alkylated phenylsulfonylhydrazone with terminal alkyne. The reaction has good function group tolerance and high yield and is applicable to a wide range of substrates.

Regioselective synthesis of 1,3,5-Trisubstituted Pyrazoles from N-Alkylated Tosylhydrazones and terminal Alkynes

Kong, Yuanfang,Tang, Meng,Wang, Yun

supporting information, p. 576 - 579 (2014/04/03)

An efficient synthesis of 1,3,5-trisubstituted pyrazoles from Nalkylated tosylhydrazones and terminal alkynes was developed. The protocol was applied to a wide range of substrates and demonstrated excellent tolerance to a variety of substituents, includin

The preparation of substituted pyrazoles from β,β-dibromo-enones by a tandem condensation/Suzuki-Miyaura cross-coupling process

Beltrán-Rodil, Sandra,Edwards, Michael G.,Pugh, David S.,Reid, Mark,Taylor, Richard J.K.

scheme or table, p. 602 - 606 (2010/09/18)

Two consecutive tandem processes are described for the regioselective, two-step synthesis of 1,3,5-trisubstituted pyrazoles from α- hydroxyketones. The first, a tandem MnO2-mediated oxidation/Ramirez olefination reaction, provides a facile route to β,β-dibromo-enones. These valuable 1,3-dicarbonyl synthons can then be converted into 1,3,5-trisubstituted pyrazoles via a second tandem hydrazine condensation/Suzuki-Miyaura cross-coupling reaction. Using these procedures, a range of aryl and alkyl α-hydroxyketones have been transformed regioselectively into 1,3,5-trisubstituted pyrazoles. Georg Thieme Verlag Stuttgart.

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