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31268-20-9

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31268-20-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 31268-20-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,2,6 and 8 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 31268-20:
(7*3)+(6*1)+(5*2)+(4*6)+(3*8)+(2*2)+(1*0)=89
89 % 10 = 9
So 31268-20-9 is a valid CAS Registry Number.

31268-20-9Relevant articles and documents

First synthesis of β-keto sulfoxides by a palladium-catalyzed carbonylative suzuki reaction

Medio-Simon, Mercedes,Mollar, Cristian,Rodriguez, Nuria,Asensio, Gregorio

, p. 4669 - 4672 (2005)

(Chemical Equation Presented) An unprecedented palladium-catalyzed three-component cross-coupling reaction between α-bromo sulfoxide, carbon monoxide, and aromatic boronic acids provides a new and efficient approach to the synthesis of β-ketosulfoxides. T

Competitive and selective Csp3-Br versus Csp2-Br bond activation in palladium-catalysed Suzuki cross-coupling: An experimental and theoretical study of the role of phosphine ligands

Mollar, Cristian,Besora, Maria,Maseras, Feliu,Asensio, Gregorio,Medio-Simon, Mercedes

supporting information; experimental part, p. 13390 - 13397 (2011/02/24)

Phosphine ligands have been demonstrated to have an effect on reactivity and selectivity in the competitive intramolecular palladium-catalysed Suzuki-Miyaura coupling of dibromo sulfoxide 1a possessing two different hybridised electrophilic carbons. It was found that the bromine bond to the sp3-hybridised carbon is selectively replaced in the presence of unhindered phosphines such as PPh3 or xantphos. The use of hindered phosphine ligands such as P(o-tol)3 and P(1-naphthyl)3 reversed the selectivity, conducting the cross-coupling at the Csp 2-Br. Identical trends were observed in external competition experiments carried out with bromomethyl sulfoxide and different substituted bromoarenes. DFT and DFT/MM calculations showed that the selectivity observed is mainly due to the different facility of the ligands to dissociate. Bisphosphine catalysts favour coupling at the sp3 carbon, whereas monophosphine catalysts prefer the sp2 carbon. Customised catalysts: Proper selection of the phosphine ligand in the palladium catalyst enables a highly intra- and intermolecular selective Suzuki-Miyaura coupling at either Csp 3-Br or Csp2-Br (see figure). DFT and DFT/MM calculations show that the selectivity observed is mainly due to the different facilities of the ligands for dissociation. Copyright

Solid-Phase Silica-Gel Catalyzed α-Halogenation of Alkyl Aryl Sulfoxides with N-Halosuccinimides

Drabowicz, Jozef

, p. 831 - 833 (2007/10/02)

Alkyl aryl sulfoxides are readily halogenated by silica-gel supported N-halosuccinimides.The conversion of optically active alkyl 4-methylphenyl sulfoxides into 1-haloalkyl 4-methylphenyl sulfoxides is accompanied by inversion of configuration at the S-atom.The stereoselectivity of the solid-phase halogenation of alkyl aryl sulfoxides is much higher than that observrd for the halogenation in solution.

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