ArticlesCobalt stearate (cas 13586-84-0)-aluminum alkyl catalyzed hydrogenation of substituted quinolines, isoquinoline and naphthalene

Add time:08/23/2019    Source:sciencedirect.com

Naphthalene (II), quinoline (III), isoquinoline (IV), 6-methylquinoline (V) and 2-methylquinoline (VI) can be hydrogenated selectively to form 1,2,3,4-tetrahydronaphthalene (VII) (100% yield at 22 °C), 1,2,3,4-tetra-hydroquinoline (VIII) (73% yield at 22 °C), 1,2,3,4-tetrahydroisoquinoline (IX) (70% yield at 90 °C), 6-methyl-1,2,3,4-tetrahydroquinoline (X) (100% at 90 °C) and 2-methyl-1,2,3,4-tetrahydroquinoline (XI) (76% at 90 °C) by use of the Ziegler-type catalyst Co(stearate)2-AlEt3 (I) in a hexane solvent at a hydrogen pressure of 700 psi. Catalyst (I) does not hydrogenate dibenzothiophene, nitroquinolines or 4-chloro-2-methylquinoline.

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