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21197-34-2

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21197-34-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21197-34-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,9 and 7 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21197-34:
(7*2)+(6*1)+(5*1)+(4*9)+(3*7)+(2*3)+(1*4)=92
92 % 10 = 2
So 21197-34-2 is a valid CAS Registry Number.

21197-34-2Relevant articles and documents

Ytterbium-Catalyzed Intramolecular [3 + 2] Cycloaddition based on Furan Dearomatization to Construct Fused Triazoles

Xu, Xiaoming,Zhong, Ying,Xing, Qingzhao,Gao, Ziwei,Gou, Jing,Yu, Binxun

supporting information, p. 5176 - 5181 (2020/07/14)

The 1,2,3-triazole-containing polycyclic architecture widely exists in a broad spectrum of synthetic bioactive molecules, and the development of expeditious methods to synthesize these skeletons remains a challenging task. In this work, the catalytic cyclization of biomass-derived 2-furylcarbinols with an azide to form fused triazoles is described. This approach takes advantage of a single catalyst Yb(OTf)3 and operates via a furfuryl-cation-induced intramolecular [3 + 2] cycloaddition/furan ring-opening cascade.

Enantioselective synthesis of cis-α-substituted cycloalkanols and trans-cycloalkyl amines thereof

Fernández, Rosario,Ros, Abel,Magriz, Antonio,Dietrich, Hansj?rg,Lassaletta, José M.

, p. 6755 - 6763 (2008/02/11)

The diastereo- and enantioselective syntheses of trans-cycloalkyl amines was accomplished through a three-step sequence consisting of: (1) asymmetric transfer hydrogenation through dynamic kinetic resolution of bicyclic and monocyclic α-substituted ketones using HCO2H/Et3N as the hydrogen source and TsDPEN-based Ru(II) catalysts, (2) nucleophilic hydroxyl to azide substitution of the resulting cis-cycloalkanols using diphenyl phosphoryl azide under modified Mitsunobu conditions, and (3) reduction of the trans-azide intermediates with LiAlH4 of PPh3/H2O to the desired targets.

PHASE TRANSFER CATALYSIS AND HOMOGENEOUS REACTIONS WITH β-OXYALKYL RADICALS FROM ORGANOMERCURIALS

Barluenga, Jose,Lopez-Prado, Joaquin,Campos, Pedro J.,Asensio, Gregorio

, p. 2863 - 2868 (2007/10/02)

β-Alkoxy- and β-hydroxyalkyl radicals generated by sodium borohydride reduction of oxymercurials react with electron deficient olefins to give addition compounds in a homogeneous process.Heterogeneous reactions are also successful in the presence of catalytic amounts of surfactants and provide a superior method for the "one pot" reductive alkylation of oxymercurials.

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