Ga / <sub> To 2 </ Sub> Catalyst System For The Establishment Of Its Application In The Study Of Organic Reactions

In this thesis, the catalytic properties of haloid compounds of boron group elements in organic synthesis have been studied. Gallium triiodide prepared easily in situ by the reaction of metallic gallium with iodine in organic media was used as a catalyst for the first time and a novel catalytic system using this Lewis acid was established. The disadvantages of traditional Lewis acids such as hygroscopic and sensitive to air were avoided in our catalytic system. The reactions such as the synthesis of α-amino phosphonates, Pechmann reaction, tetrahydropyranylation of alcohols and phenols, the protection of carbonyl compounds, the synthesis of benzimidazoles derivatives et al catalyzed by this catalyst were studied, and the reaction conditions such as temperature, solvent, reaction time, the amount of catalyst and the reactant ratios were optimized and the target products were gained in good to excellent yields. The reaction mechanisms were discussed systematically. The results showed that the catalytic system has a high activity to many organic reactions and it is eager to be used widely. Some products were used as ligands for the synthesis of iridium complexes and the electrochemical and phosphorescent properties of the complexes were researched.