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82660-71-7

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82660-71-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 82660-71-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,6,6 and 0 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 82660-71:
(7*8)+(6*2)+(5*6)+(4*6)+(3*0)+(2*7)+(1*1)=137
137 % 10 = 7
So 82660-71-7 is a valid CAS Registry Number.

82660-71-7Relevant articles and documents

Novel Synthesis of Five- and Six-Membered Spiro γ-Lactones in Rigid Bicyclic Systems

Cannone, Persephone,Belanger, Denis,Lemay, Gilles

, p. 3953 - 3959 (2007/10/02)

The reaction of bis(bromomagnesio)alkanes with bridged tricyclic endo- and exo-dicarboxylic anhydrides and their dihydro derivatives provides a general and versatile route to corresponding tricyclic spiro γ-butanolides.Futher extension of this methodology to the dianhydride of bicyclooctene showed appreciable regioselectivity.The subsequent transformation of spiro γ-lactones into 4-spiro-2-butenolides by retro-Diels-Alder reaction has provided a simple and convenient synthesis of these molecules.Proton and 13C NMR spectra are reported for most of the compounds.

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