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33951-43-8

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33951-43-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 33951-43-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,9,5 and 1 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 33951-43:
(7*3)+(6*3)+(5*9)+(4*5)+(3*1)+(2*4)+(1*3)=118
118 % 10 = 8
So 33951-43-8 is a valid CAS Registry Number.

33951-43-8Relevant articles and documents

Bismuth trichloride-catalyzed oxy-Michael addition of water and alcohol to α,β-unsaturated ketones

Wu, Zhen,Feng, Xue-Xin,Wang, Qing-Dong,Yun, Jin-Jin,Rao, Weidong,Yang, Jin-Ming,Shen, Zhi-Liang

supporting information, p. 1297 - 1300 (2019/09/30)

An efficient method was developed for the conjugate addition of water to various α,β-unsaturated ketones by using bismuth(III) chloride as a catalyst. The reactions proceeded smoothly in the presence of a catalytic amount of BiCl3 (20 mol%) in aqueous media to furnish a variety of synthetically useful β-hydroxyl ketones in moderate to good yields. Apart from water molecule, various alcohols could also be employed as nucleophiles to react with α,β-unsaturated ketones, leading to β-alkoxyl ketones in modest to high yields. In addition, the mild reaction conditions also entailed the conjugate addition reactions to proceed with the tolerance to a range of functional groups.

Synthesis of β-oxo carbonyl and thiocarbonyl compounds via basic sulfur abstraction

Silva, Saúl,Maycock, Christopher D.

, (2019/09/10)

Sulfur abstraction from suitable thioesters represents a mild method for the formation of carbon-carbon bonds and the formation of 1,3-dicarbonyl compounds. A study of the scope and limitations of this reaction for the synthesis of these or mixed 1,3-carbonyl/thiocarbonyl compounds by a base promoted sulfur abstraction rearrangement is described. These reactions were typically very clean and the products were obtained in good yield (65–95%) in just 30 min. This method is particularly efficient for the introduction of thiocarbonyl containing groups. Thus, it constitutes a synthetic strategy for the generation of a new carbon-carbon bond and the regioselective preparation of mixed β-dicarbonyl compounds.

A tandem reaction initiated by 1,4-addition of bis(iodozincio)methane for 1,3-diketone formation

Sada, Mutsumi,Matsubara, Seijiro

supporting information; experimental part, p. 432 - 433 (2010/03/25)

(Chemical Equation Presented) Treatment of an γ-acyloxy-α, β-unsaturated ketone with bis(iodozincio)methane leads to a novel tandem reaction consisting of three steps: (1) 1,4-addition of the dizinc reagent to the enone, which affords the corresponding zinc enolate of the β-zinciomethylated ketone; (2) intramolecular nucleophilic attack by the enolate on the ester group; and (3) Grob-type fragmentation of the adduct, accompanied by elimination of the zinc alkoxide of allyl alcohol. The overall reaction gives 1,3-diketones efficiently. Copyright

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