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52168-66-8

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52168-66-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 52168-66-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,2,1,6 and 8 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 52168-66:
(7*5)+(6*2)+(5*1)+(4*6)+(3*8)+(2*6)+(1*6)=118
118 % 10 = 8
So 52168-66-8 is a valid CAS Registry Number.

52168-66-8Downstream Products

52168-66-8Relevant articles and documents

The hydrogen bond directing effect in nitrile oxide cycloadditions to allylic substituted cyclopentenes

Cardarelli, Anna Maria,Fassardi, Vera,Memeo, Misal Giuseppe,Quadrelli, Paolo

, p. 2602 - 2613 (2017/04/10)

A quantitative evaluation of the H-bond directing effect on the stereoselectivity in the cycloaddition of nitrile oxides to 2-cyclopenten-1-ol and allylic cyclopentenyl amides is reported. In apolar solvents the H-bond directing effect promotes a high syn stereoselectivity while H-bond acceptor solvents divert the reactions to the anti face of the dipolarophile. Taft's β parameter gives a good description of the solvent effect on the H-bond directing effect. The persistence of some syn stereoselectivity even in good H-bond acceptor solvents points out the existence of some residual hydrogen bond direction. The syn stereoselectivity in the presence of M(II) salts was also investigated and the results discussed in the light of the potential application of these scaffolds in nucleoside synthesis.

Directed Nitrile Oxide Cycloaddition Reactions. The Use of Hydrogen Bonding To Direct Regio- and Stereochemistry in Nitrile Oxide Cycloadditions with Cyclopentenylamides

Curran, Dennis P.,Choi, Sung-Mo,Gothe, Scott A.,Lin, Fu-tyan

, p. 3710 - 3712 (2007/10/02)

2 deg amides derived from cyclopentenylamine direct the regio- and stereochemistry of cycloaddition reactions with benzonitrile oxide and 2,2-dimethylpropane nitrile oxide by hydrogen bonding.

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