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20452-56-6

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20452-56-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20452-56-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,4,5 and 2 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 20452-56:
(7*2)+(6*0)+(5*4)+(4*5)+(3*2)+(2*5)+(1*6)=76
76 % 10 = 6
So 20452-56-6 is a valid CAS Registry Number.

20452-56-6Downstream Products

20452-56-6Relevant articles and documents

Acid-induced rearrangement reactions of reduced benzoquinone cyclopentadiene cycloadducts

Eipert, Martin,Maichle-Moessmer, Caecilia,Maier, Martin E.

, p. 8692 - 8695 (2002)

Several Diels-Alder adducts between benzoquinones and cyclopentadiene were reduced to the corresponding diols 7a-c and 11. Treatment of these diols with strong acid triggered a skeletal rearrangement reaction resulting in compounds 8a-c and 12 that contain a 4,8-methanoazulene substructure. In addition, a dyotropic-like rearrangement of the tetracyclic lactone 13 to the spirolactone 18 was observed. Five of the structures were supported by X-ray analysis.

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