Anion-Binding Catalysis

8Quaternary Ammonium, Phosphonium, and Tertiary Sulfonium Salts as Hydrogen‐Bonding Catalysts

Seiji Shirakawa

Nagasaki University, Graduate School of Fisheries and Environmental Sciences, Department of Environmental Science, 1‐14 Bunkyo‐machi, Nagasaki, 852‐8521, Japan

8.1 Introduction

Onium salts are recognized as an important class of compounds not only in the field of chemical science but also in the fields of material and biological sciences [1]. The powerful synthetic utility of onium salts such as quaternary ammonium, phosphonium, and tertiary sulfonium salts is well established in the field of organic chemistry. These onium salt compounds are frequently utilized as useful organic reagents in the construction of important building blocks. ...