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137531-66-9

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137531-66-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137531-66-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,5,3 and 1 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 137531-66:
(8*1)+(7*3)+(6*7)+(5*5)+(4*3)+(3*1)+(2*6)+(1*6)=129
129 % 10 = 9
So 137531-66-9 is a valid CAS Registry Number.

137531-66-9Relevant articles and documents

New General Approach to the Synthesis of Yuehchukene Analogues. Stereoselective Synthesis of 9,10-Dihydro-7α,9-didemethylyuehchukene. X-Ray Molecular Structure of 6β-(Indol-3'-yl)-7β-methyl-5-phenylsulphonyl-5,6,6aβ,7,8,9,10,10aβ-octahydroindenoindole

Cheng, Kin-Fai,Chan, Kwok-Pong,Lai, Ting-Fong

, p. 2461 - 2465 (2007/10/02)

A versatile synthetic strategy for the syntheses of the yuehchukene analogues 6β-(indol-3'-yl)-7β-methyl-5,6,6aβ,7,8,9,10,10aβ-octahydroindenoindole and 7β-methyl-6β-(2'-methylindol-3'-yl)-5,6,6aβ,7,8,9,10,10aβ-octahydroindenoindole is described.The key reactions involve trapping of the vinyllithium derivative 6-methylcyclohex-1-enyllithium, generated from the trisylhydrazone of 2-methylcyclohexanone, with indole-2-carbaldehyde, and Nazarov cyclization of the α,β-unsaturated 2-acylindole 6-methylcyclohex-1-enyl N-phenylsulphonylindol-2-yl ketone.

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