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190840-84-7

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190840-84-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 190840-84-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,0,8,4 and 0 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 190840-84:
(8*1)+(7*9)+(6*0)+(5*8)+(4*4)+(3*0)+(2*8)+(1*4)=147
147 % 10 = 7
So 190840-84-7 is a valid CAS Registry Number.

190840-84-7Downstream Products

190840-84-7Relevant articles and documents

An Expedient Route for the Stereoselective Construction of Bridged Polyheterocyclic Ring Systems Using the Tandem "Pincer" Diels-Alder Reaction

Lautens, Mark,Fillion, Eric

, p. 4418 - 4427 (2007/10/03)

The tandem "pincer" Diels-Alder reaction, consisting of two consecutive [4 + 2] cycloadditions between two dienes and an acetylenic bis-dienophile, has been applied toward the rapid construction of bridged polyoxacyclic ring systems when furan derivatives are used as the diene components. The study has demonstrated the stereoselectivity (exo-exo adduct), the chemoselectivity ("pincer" vs "domino"), as well as the regioselectivity of the reaction. The reaction has been successfully applied to a variety of 2-substituted furans and tethered bis-furans in combination with mono-activated and diactivated dienophiles. The synthesis of unsymmetrical cycloadducts starting from the aza- and oxanorbornadiene-type intermediate has also been realized.

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