Used as a sulfur-transfer reagent in organic synthesis, particularly in the preparation of thiocarbonyl compounds. It serves as a key intermediate in the formation of thioamides, thioureas, and heterocyclic sulfur-containing compounds. Commonly employed in the synthesis of pharmaceuticals and agrochemicals where sulfur functionality is required. Its reactivity allows for efficient conversion under mild conditions, making it valuable in multi-step synthetic routes. Also utilized in the development of dyes and functional materials due to its ability to introduce bis(methylthio) groups into organic frameworks.