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21759-74-0

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21759-74-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21759-74-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,5 and 9 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21759-74:
(7*2)+(6*1)+(5*7)+(4*5)+(3*9)+(2*7)+(1*4)=120
120 % 10 = 0
So 21759-74-0 is a valid CAS Registry Number.

21759-74-0Relevant articles and documents

Carbonylation of silylated hydroxymethyl aziridines to β-lactams

Davoli, Paolo,Moretti, Irene,Prati, Fabio,Alper, Howard

, p. 518 - 521 (1999)

Functionalized β-lactams are synthesized by carbonylative ring expansion of silylated hydroxymethyl aziridines catalyzed by dicobalt octacarbonyl, a process that proceeds with inversion of configuration. Ring opening and elimination occurs on attempted carbonylation of aziridine carboxylates.

Highly efficient and facile synthesis of β-enaminones catalyzed by diphenylammonium triflate

Zhao, Ting-Ting,Song, Jiang-Long,Hong, Feng-Qing,Xia, Jian-Sheng,Li, Jian-Jun

, p. 2857 - 2868 (2019/08/21)

Abstract: The catalytic performance of diphenylammonium triflates as an organocatalyst in the synthesis of β-enaminones from various substituted β-diketones and amides (or amines) were evaluated. A wide range of β-enaminones were efficiently synthesized in good to excellent yields under mild reaction conditions. Applying diphenylammonium triflate (DPAT) as catalyst makes this protocol cost-effective, low corrosive and easy to handle. Graphic abstract: [Figure not available: see fulltext.].

Transformation of One-Dimensional Achiral Structure to Three-Dimensional Chiral Structure: Mechanistic Study and Catalytic Activities of Chiral Structure

Rao, Purna Chandra,Chaudhary, Sonu Pratap,Kuznetsov, Denis,Mandal, Sukhendu

supporting information, p. 12669 - 12674 (2016/12/26)

We have isolated two copper-based coordination polymers through solvent diffusion and solvothermal methods using copper salt, furan dicarboxylic acid (FDC), 4,4′-bipyridine (bpy) in MeOH/ethylene glycol, and water solvents. Compound 1 is adopting P21/c space group and adopts a one-dimensional wirelike structure with a free carboxylate anion. Compound 2 crystallizes in chiral space group P65. This is a three-dimensional structure with helical chains. This helicity might be the reason for chiral generation and symmetry breaking. We have converted compound 1 to compound 2 using grinding, followed by a solvothermal method. The circular dichroism data of 2 showed that it is an enantioenriched compound. We have shown that compound 2 is a very good catalyst for chemo- and regioselective enamination reaction and for azide-alkyne Huisgen cycloaddition, respectively.

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