Aniline hydrogenation in the presence of alumina-supported rhodium under hydrogen pressure

Stereoselective Synthesis of Alicylic Amines

“…Similar effects have been seen in aniline hydrogenation where cyclohexylamine has been found to cause catalyst deactivation [19][20][21][22]. The rational for this is that the basic lone pair on the nitrogen atom forms a strong bond to the active metal.…”

Enhanced Selectivity in the Hydrogenation of Anilines to Cyclo‐aliphatic Primary Amines over Lithium‐Modified Ru/CNT Catalysts

“…Ruthenium and rhodium were envisioned to be the most suitable metals for the hydrogenation of aromatic amines, based on the successful use of these two metals in related hydrogenation reactions . Carbon nanotubes (CNT) were chosen as the support, as they are generally inert materials, and specific modification, such as directed oxidation of surface groups, results in well‐defined and predictable functional groups .…”

Hydrogenation of aniline to cyclohexylamine on NaOH-promoted or lanthana supported nickel

“…In addition to cyclohexylamine (CHA), the products always include dicyclohexylamine (DCHA) and ammonia [1,2], and at elevated temperature the formation of diphenylamine, phenylcyclohexylamine, cyclohexane and benzene is also reported [3]. Moreover, in aqueous media, hydrolysis products (cyclohexanone and cyclohexanol) could also be detected [4][5][6][7][8].…”

“…In non-acidic solution, liquid phase reactions are camed out generally at 100 -250~ and 1 -10 MPa pressure [1, [4][5][6][7][8][9][10][11]. Under such conditions the selectivity of CHA formation was found to be increasing with the 1-12 pressure and varying inversely with temperature [4][5][6][7][8][9].…”

“…Under such conditions the selectivity of CHA formation was found to be increasing with the 1-12 pressure and varying inversely with temperature [4][5][6][7][8][9]. Optimum selectivity values referring to 423 K and 6-10 MPa were as follows: nearly 50 % for skeletal Ni, skeletal Co and skeletal Ni-Cr catalysts [4][5], 90.7 % for Ru/MgO2 [6], 79.9 % for Rh black, 91.9 % for Ir black and 96.8 % for Ru black catalysts [7,8]. At 363-373 K and 7 MPa pressure, the hydrogenation of ring-substituted anilines over ruthenium 0133-1736t98/US$12.00.…”