Uniformly microporous diatomite supported Ni0/2+ catalyzed controllable selective reductive amination of benzaldehydes to primary amines, secondary imines and secondary amines

Selectivity tunable iron nanoparticles from lignocellulosic components for the reductive amination of carbonyl compounds towards switchable products

“…More than that, the selectivity on specific products ( i.e. , amine or imine) could be surprisingly switched by changing the porous structure of HPS during synthesis, correlating well with the recent works by Zhang et al 16 who controlled the switchable selectivity by adjusting the ratio of Ni 2+ to Ni 0 . Both of them inspired the new concept on the switchable routes of reductive amination, and the key factors may be closely related to the correlation of structural features with the metallic phase in heterogeneous systems, which is still confused albeit the preliminary results have been recently reported.…”

“…However, both the catalytic activities of commercial Fe and Fe 3 O 4 were far away from the prepared catalysts, indicating that there were synergistic effects between the metallic nanoparticles and carbonaceous supports. 32,50 It is also interesting that the ratio of Fe 3+ and Fe 2+ could affect the catalytic selectivity to some extent; 14,16 according to the varied degrees of oxidation in Fe x O y @HC (the inset in Fig. 11), a suitable range of Fe 3+ /Fe 2+ around 0.5 was recommended for the synthesis of secondary imines, but it should be vigilant that other structural characteristics might simultaneously cause potential effects on the above selectivity.…”

Continuous Hydrogenation of Nitriles to Primary Amines with High Selectivity in Flow by Using Raney Cobalt

“…For example, Lu et al [12] . used bimetallic Pd−Ni oxide nanomodified catalysts to achieve a primary amine yield of about 92 % in the selective hydrogenation reaction of benzonitrile; Zhang et al [7b] . adjusted Ni 0 /Ni 2+ and diatomite support in supported nickel catalysts, and primary amine selectivity in the benzaldehyde reduction amination reaction reached only 92 %, proving that there is room for improvement.…”

General synthesis of secondary imines via reductive coupling of carbonyl and nitro compounds employing a reusable cobalt catalyst

“…As shown in Table 2, a broad range of aromatic/hetero-aromatic, alicyclic and aliphatic aldehydes were aminated successfully, affording the corresponding secondary imines in yields of 71–97% (Table 2, entries 1–20), which was comparable or even superior to the reported methods (Table S7, ESI†). 9,10,28,29 The electronic properties of the substituted groups showed no obvious effect on the activity of the substituted benzyl aldehydes. Meanwhile, no steric hindrance was observed for the ortho -substituent aromatic aldehydes (Table 2, entries 3, 10 & 12).…”

“…More importantly, Co@NC-800 was also effective for the reductive amination of inert alicyclic and aliphatic aldehydes, which was challenging (Table 2, entries 17–20). 10,28,29…”