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128612-44-2

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128612-44-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128612-44-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,6,1 and 2 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 128612-44:
(8*1)+(7*2)+(6*8)+(5*6)+(4*1)+(3*2)+(2*4)+(1*4)=122
122 % 10 = 2
So 128612-44-2 is a valid CAS Registry Number.

128612-44-2Relevant articles and documents

Synthesis method of 3, 5-dihydroxypentene benzene

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Paragraph 0050-0052, (2020/07/21)

The invention provides a synthesis method of 3, 5-dihydroxypentene benzene. The synthesis method comprises the following steps: reacting 3, 5-dimethoxyphenol used as a raw material with a sulfonate halide reagent to generate sulfonate, carrying out cross-coupling reaction with a nucleophilic reagent to introduce amyl, and finally reducing methoxyl into phenolic hydroxyl, thereby obtaining the product 3, 5-dihydroxypentene benzene. The synthesis method solves the defects of high cost, complex route, low yield, poor purity and the like of the traditional process.

NiCl2(dppe)-Catalyzed Cross-Coupling of Aryl Mesylates, Arenesulfonates, and Halides with Arylboronic Acids

Percec, Virgil,Golding, Geoffrey M.,Smidrkal, Jan,Weichold, Oliver

, p. 3447 - 3452 (2007/10/03)

An investigation of the NiCl2(dppe)-, NiCl2(dppb)-, NiCl2(dppf)-, NiCl2(PCy3)2-, and NiCl2(PPh3)2- catalyzed cross-coupling of the previously unreported aryl mesylates, and of aryl arenesulfonates, chlorides, bromides, and iodides containing electron-withdrawing and electron-donating substituents with aryl boronic acids, in the absence of a reducing agent, is reported. NiCl2(dppe) was the only catalyst that exhibited high and solvent-independent activity in the two solvents investigated, toluene and dioxane. NiCl2(dppe) with an excess of dppe, NiCl 2(dppe)/dppe, was reactive in the cross-coupling of electron-poor aryl mesylates, tosylates, chlorides, bromides, and iodides. This catalyst was also efficient in the cross-coupling of aryl bromides and iodides containing electron-donating substituents. Most surprisingly, the replacement of the excess dppe from NiCl2(dppe)/dppe with excess PPh3 generated NiCl2(dppe)/PPh3, which was found to be reactive for the cross-coupling of both electron-rich and electron-poor aryl mesylates and chlorides. Therefore, the solvent-independent reactivity of NiCl2(dppe) provides an inexpensive and general nickel catalyst for the cross-coupling of aryl mesylates, tosylates, chlorides, bromides, and iodides with aryl boronic acids.

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