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136558-68-4

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136558-68-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 136558-68-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,6,5,5 and 8 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 136558-68:
(8*1)+(7*3)+(6*6)+(5*5)+(4*5)+(3*8)+(2*6)+(1*8)=154
154 % 10 = 4
So 136558-68-4 is a valid CAS Registry Number.

136558-68-4Downstream Products

136558-68-4Relevant articles and documents

Diels-Alder Reactions of Methyl- and ?-Acceptor-Substituted 2-Vinylindoles with Dimethyl Acetylenedicarboxylate and Tetracyanoethylene: Novel Functionalized Carbazoles

Pindur, Ulf,Eitel, Manfred

, p. 951 - 954 (2007/10/02)

The Diels-Alder reactions of the 2-vinylindoles 1a-1d, which are now readily accessible, with dimethyl acetylenedicarboxylate and tetracyanoethylene give rise to the novel 1,2-dihydro- and 1,2,3,4-tetrahydrocarbazoles 2, 4, and 5 as well as the fully aromatized carbazoles 3.With regard to the product spectrum, the mechanistic rationale comprises a Diels-Alder step, formal 1,3-hydrogen shift, ene reaction, and dehydrogenation.Conformational aspects of the 1,2-dihydrocarbazoles 2b and 2c are also discussed.

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