**6. Conclusions**

Schiff's base properties have been demonstrated to play an important role in many responses as a key to increasing yield and product selection. Important structural kinds and Schiff base ligand types were discovered by the catalytic activity of Schiff base complexes, such as the early oligomerization of isoprene and butadienes. Schiff base and OH group have demonstrated greater olefin epoxidation effectiveness than

**Figure 22.** *Proposed mechanism for palladium complex catalyzed oxidation of alcohols by NMO.*

**Figure 23.** *Results of recycling on conversion of benzylalcohol.*

**Figure 24.** *Scheme for epoxidation of alkenes.*

**Figure 25.** *Metal complexes for the catalytic application in Heck and Suzuki reactions.*

untreated ligands or aryl. As detailed in this chapter, the flexible metals are combined with Schiff base ligands to assure a good function in changing the reaction to industrial value. Over the years, the structure of the metal structures containing the Schiff base has piqued the public's interest. Because of their low cost and ease of synthesis, as well as their chemical and thermal stability, Schiff base transition metal complexes are a popular oxidation catalyst for a wide range of organic substrates. Important reactions catalyzed by Schiff base metal complexes include oxidation reactions,

**Figure 26.** *Structures of benzimidazole-based Schiff base palladium complex (1) and [(EMIM) PF6 (2).*

**Figure 27.** *Mechanism for the palladium complex catalyzed transfer hydrogenation.*

**Figure 28.** *Synthesis of benzazoles.*

reductions, polymerizations, hydroformylation, coupling reactions, the oxidation of sulfides to sulfoxides, alkenes to epoxides and diols, and the activation of hydrocarbons. Yet there is still a huge need for new Schiff bases and their metal complexes as catalysts for organic transformations.
