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20469-72-1

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20469-72-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20469-72-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,4,6 and 9 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 20469-72:
(7*2)+(6*0)+(5*4)+(4*6)+(3*9)+(2*7)+(1*2)=101
101 % 10 = 1
So 20469-72-1 is a valid CAS Registry Number.

20469-72-1Relevant articles and documents

Rhodium-Catalyzed Pyridine N-Oxide Assisted Suzuki-Miyaura Coupling Reaction via C(O)-C Bond Activation

Zhong, Jing,Long, Yang,Yan, Xufei,He, Shiyu,Ye, Runyou,Xiang, Haifeng,Zhou, Xiangge

supporting information, p. 9790 - 9794 (2019/12/24)

A rhodium-catalyzed Suzuki-Miyaura coupling reaction via C(O)-C bond activation to form 2-benzoylpyridine N-oxide derivatives is reported. Both the C(O)-C(sp2) and C(O)-C(sp3) bond could be activated during the reaction with yields up to 92%. The N-oxide moiety could be employed as a traceless directing group, leading to free pyridine ketones.

Synthesis of β,β-disubstituted indanones via the Pd-catalyzed tandem conjugate addition/cyclization reaction of arylboronic acids with α,β-unsaturated esters

Gao, Ang,Liu, Xiu-Yan,Li, Hao,Ding, Chang-Hua,Hou, Xue-Long

, p. 9988 - 9994 (2018/05/31)

Under Pd catalysis with a newly synthesized electron-deficient heterocycle, 2-(4,5-dihydroimidazol-2-yl)- pyrimidine (as the ligand), the reaction of α,β-unsaturated esters with arylboronic acids afforded a wide range of 3,3-disubstituted indan-1-ones bearing a quaternary carbon in high yields. Mechanistic studies revealed that the reaction involves a tandem conjugate addition/1,4-Pd shift followed by a cyclization.

Single-isomer trisubstituted olefins from a novel reaction of (E)-βchloro-α-iodo-α,β-unsaturated esters and amides

Simard-Mercier, Julie,Jiang, Jojo Liu,Ho, Michael L.,Flynn, Alison B.,Ogilvie, William W.

, p. 5899 - 5906 (2008/12/21)

(Chemical Equation Presented) (E)-β-Chloro-α-iodo-α, β-unsaturated esters are converted to single isomer trisubstituted olefins bearing three different carbon substituents by cross-coupling under reflux. Mechanistic investigations suggest that this process transfers a hydrogen from the boronic acid to the α-position of the substrate and then introduces an aryl group to the β-position of the intermediate template while replacing chloride. The reaction is highly stereoselective, showing preference for the E-isomer. The process proceeds through (E)-β-chloro-α-aryl-α, β-unsaturated esters that are transformed efficiently into the corresponding E-products through stereoselective Suzuki-type reactions giving single isomers. The observed stereo-chemistry is apparently enabled by the intermediacy of a palladium allenoate. The reaction involves a catalytic cycle in which PdII is reduced to Pd0 through the formation of biaryl-coupled products.

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