Application Of Ion-supported Compounds In Organic Synthesis

This dissertation includes three parts. The first chapter is about the application of task-specific ionic liquids in organic chemistry in these years. The second one is about the application of diacetoxyiodobenzene in organic chemistry recent years. The third, my research in ion-supported compouds, is about the ion-supported hypervalent iodine and TEMPO using in organic chemistry.There are two parts in chapter one. Part one is a summary of common ionic liquids including their compositions, properties and preparations. Part two reviews recent developments of task-specific ionic liquids.Chapter two introduces the recent developments of diacetoxyiodobenzene and [bis(trifluroroacetoxy)iodo]benzene in organic synthesis from four parts: a. oxidations, b. formation of carbon-carbon bonds, c. formation of carbon-heteroatom and heteroatom-heteroatom bonds, d. fragmentations and rearrangements.There are three parts in chapter three. In part one an ion-supported (diacetoxyiodo) benzene was synthesized and applied to selective oxidation of alcohols in an ionic liquid. It was found that this system has high selectivity in oxidation of alcohols and the ion-supported (diacetoxyiodo)benzene can be recycled and reused. In part two selective oxidation of thiourea derivatives with an ion-supported (diacetoxyiodo)benzene in ionic liquids provided a method for the synthesis of 1,2,4-thiadiazolidines in high yields. The oxidant ion-supported (diacetoxyiodo)benzene can be recycled and reused for 6 times without decreasing its efficiency. In the last part three new types of ion-supported TEMPO catalysts were synthesized and could be used to catalyse selective oxidation of alcohols in water. Combination of the catalysts with an oxidant ion-supported (diacetoxyiodo)benzene in water consists of a green system for the oxidation in which both catalysts and oxidant can be recycled and reused.