As catalyst precursors, imidazolide salts can form stable complexes with metals and promote a variety of organic reactions, especially in transition metal catalysis and coordination chemistry. Cycloalkylaminocarbene precursors (CAAC precursors) provide a stable carbene source and can synthesize stable CAAC metal complexes. These complexes have excellent stability and high efficiency in catalytic reactions, especially under high temperatures or extreme conditions. These compounds have important application value in catalytic chemistry, material synthesis, and the development of new functional molecules.