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52720-24-8

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52720-24-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 52720-24-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,2,7,2 and 0 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 52720-24:
(7*5)+(6*2)+(5*7)+(4*2)+(3*0)+(2*2)+(1*4)=98
98 % 10 = 8
So 52720-24-8 is a valid CAS Registry Number.

52720-24-8Downstream Products

52720-24-8Relevant articles and documents

Forbidden reactions, II. - The disrotatory cyclobutene ringopening

Roth, Wolfgang R.,Rekowski, Volker,Boerner, Sabine,Quast, Michael

, p. 409 - 430 (2007/10/03)

The energy profiles for the con- and disrotatory opening of benzocyclobutene, methylenecyclobutene, and cyclobutene derivatives were established by NO and oxygen trapping. The enthalpy for the transition states for the "forbidden" reactions proofed to be identical with the heat of formation of the orthogonal diradicals derived by geometrical isomerization of the dienes formed in these reactions. These diradicals describe very well the activation barriers observed for the disrotatory opening of bicyclic cyclobutenes ([3.2.0] and [2.2.0] systems), but not for bicyclo[2.1.0]pent-2-ene, indicating here a truly forbidden reaction. VCH Verlagsgesellschaft mbH, 1996.

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