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199789-65-6

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199789-65-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 199789-65-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,9,7,8 and 9 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 199789-65:
(8*1)+(7*9)+(6*9)+(5*7)+(4*8)+(3*9)+(2*6)+(1*5)=236
236 % 10 = 6
So 199789-65-6 is a valid CAS Registry Number.

199789-65-6Downstream Products

199789-65-6Relevant articles and documents

Aryl Radical Endo Cyclization of Enamidines. Selective Preparation of Trans and Cis Fused Octahydrobenzo[f]quinolines

Ripa, Lena,Hallberg, Anders

, p. 84 - 91 (2007/10/03)

Aryl radicals from N-protected 6-[2-(2-halophenyl)ethyl]-1,2,3,4-tetrahydropyridines and 6-[3-(2-halophenyl)propyl]-1,2,3,4-tetrahydropyridines undergo intramolecular cyclization onto the enamide/ enamidine double bond by 6-endo and 7-endo closure, respectively. In the 6-endo cyclization the trans/cis ratio of the formed N-protected octahydrobenzo[f]quinoline can be controlled, and selective synthesis of either the trans or the cis isomer can be achieved with triphenyltin hydride and tris(trimethylsilyl)silicon hydride, respectively. In the 7-endo cyclization to N-protected octahydro-1H-benzo[3,4]cyclohepta[1,2-b]pyridine, the trans fused isomer predominates, although the selectivity is low. The oxidized cyclization products, with a restored enamide/enamidine double bond, are formed at low concentrations of tris(trimethylsilyl)silicon hydride.

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