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118721-49-6

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118721-49-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 118721-49-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,7,2 and 1 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 118721-49:
(8*1)+(7*1)+(6*8)+(5*7)+(4*2)+(3*1)+(2*4)+(1*9)=126
126 % 10 = 6
So 118721-49-6 is a valid CAS Registry Number.

118721-49-6Relevant articles and documents

Anticancer prodrug studies: DielsAlder chemistry of 1-methylthio-1-(p- tolylsulfonyl)ethene

Pratt, Andrew J.,Rendle, Phillip M.,Steel, Peter J.

experimental part, p. 945 - 950 (2012/08/27)

The reactivity of 1-methylthio-1-(p-tolylsulfonyl)ethene (1) as a dienophile in DielsAlder chemistry is investigated. Cycloaddition reactions were carried out with a range of pyran-2-ones and isobenzofurans. The initial DielsAlder adducts have the potenti

Novel synthesis of γ-lactones starting from β,γ-unsaturated carboxylic esters

Kayano,Yajima,Akazome,Fujita,Ogura

, p. 3599 - 3609 (2007/10/03)

A novel synthetic route to highly substituted γ-lactones was achieved by an intermolecular radical addition to 4-(methylthio)-4-(p-tolylsulfonyl)-3-butenoic ester (1) and its 2-(ethoxycarbonyl) derivative (2), which were easily prepared from (methylthio)methyl p-tolyl sulfone. Upon the irradiation of a solution of 1 and benzophenone in an alcohol (R1R2CHOH), the 1-hydroxyalkyl radical (R1R2C-OH) was generated and added regiospecifically to the 3-position of 1 to form an adduct that led to a γ-lactone by spontaneous intramolecular condensation. Similarly, 2 reacted with the alcohol to give α-(ethoxycarbonyl)-γ-lactones. The alcohol, which is a high boiling liquid or solid, can be employed in the form of a solution (10 molar amounts in acetonitrile) without greatly lowering the reaction efficiency.

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