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856198-59-9

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856198-59-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 856198-59-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,5,6,1,9 and 8 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 856198-59:
(8*8)+(7*5)+(6*6)+(5*1)+(4*9)+(3*8)+(2*5)+(1*9)=219
219 % 10 = 9
So 856198-59-9 is a valid CAS Registry Number.

856198-59-9Relevant articles and documents

Photochemically generated bicyclic ortho-quinodimethanes: Photo- enolization of bicyclic aldehydes and ketones

Connolly, Terrence J.,Durst, Tony

, p. 15969 - 15982 (1997)

A photoenolization route to bicyclic ortho-quinodimethanes was investigated. Bicyclic photoenols were trapped in an intermolecular fashion with various dienophiles for the first time. All ortho-quinodimethane precursors were prepared via a selective route commencing with 1-indanol, α- tetralol and 1-benzosuberone. Irradiation afforded the E-photoenols exclusively which were trapped with equal efficiency except that derived from indane-4-carboxaldehyde. This low efficiency has been ascribed to rapid auto- oxidation of the aldehyde to carboxylic acid. The facial selectivity of the reaction between the photoenol from benzosuberan-9-carboxaldehyde and dimethyl fumarate was much lower when compared to the other aldehydes in this study. A distorted diene caused by the presence of the seven membered ring explains these results.

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