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28591-11-9

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28591-11-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28591-11-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,5,9 and 1 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 28591-11:
(7*2)+(6*8)+(5*5)+(4*9)+(3*1)+(2*1)+(1*1)=129
129 % 10 = 9
So 28591-11-9 is a valid CAS Registry Number.

28591-11-9Relevant articles and documents

SCHWEFELVERBINDUNGEN DES ERDOELS XV. METHYL-5,6,7,8-TETRAHYDRODINAPHTHOTHIOPHENE UND METHYLDINAPHTHOTHIOPHENE

Boberg, Friedrich,Jachiewicz, Adam,Garming, Alfons

, p. 1 - 12 (2007/10/02)

A one pot synthesis gives methyl-5,6,7,8-tetrahydrodinaphthothiophenes (7) from methyl-1,2,3,4-tetrahydronaphthalen-1-ones (1) by bromination and sulfurization.Tetrahydro compounds 7 have been dehydrogenated to corresponding dinaphthothiophenes 8.Proofs for the constitutions are nmr data of 7, 8 and the independent synthesis of one compound 8.A reaction mechanism with 1,4-dithiine intermediates is discussed. Key words: Alkyl-1,2,3,4-tetrahydronaphthalen-1-ones; alkyl-5,6,7,8-tetrahydrodinaphthothiophenes; alkyldinaphthothiophenes; dehydrogenation with o-chlorobenzoquinone.

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