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267666-12-6

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267666-12-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 267666-12-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,7,6,6 and 6 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 267666-12:
(8*2)+(7*6)+(6*7)+(5*6)+(4*6)+(3*6)+(2*1)+(1*2)=176
176 % 10 = 6
So 267666-12-6 is a valid CAS Registry Number.

267666-12-6Relevant articles and documents

Lewis Acid-Directed Cyclocondensation of Piperidone Enol Ethers with 2-Methoxy-4-(N-phenylsulfonyl)-1,4-benzoquinoneimine: A New Regioselective Synthesis of Oxygenated Carbolines

Engler, Thomas A.,Wanner, Jutta

, p. 2444 - 2457 (2007/10/03)

Lewis acid-directed cyclocondensations of piperidone enol ethers with 2-methoxy-4-(N-phenylsulfonyl)-1,4-henzoquinoneimine are reported. Benzofurans are obtained with BF3·OEt2 as a promoter, whereas use of excess amounts of TiCl4:Ti(OiPr)4 leads to tetrahydrocarbolines. The latter reactions provide expedient routes to oxygen-substituted tetrahydrocarbolines and carbolines. As applications of this new methodology, the preparations of 1-[3-(dimethylamino)propyl]amino-7-methoxy- and 1-[3-(dimethylamino)propyl]amino-7,8-dimethoxy-5H-pyrido[4,3-b]indoles are described.

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