Arecaidine but-2-ynyl ester tosylate is primarily utilized in research and development within the field of neuroscience and pharmacology. It acts as a selective agonist for certain acetylcholine receptors, particularly the muscarinic subtype. This property makes it valuable for studying receptor function, signal transduction pathways, and the physiological effects of cholinergic activation in the central and peripheral nervous systems. Researchers often employ it to investigate conditions related to cognitive function, memory, and neurodegenerative diseases like Alzheimer's. Additionally, it serves as a tool compound in drug discovery efforts aimed at developing therapeutics targeting muscarinic receptors. Its specificity and potency make it a critical reagent in experimental studies exploring the role of acetylcholine in various biological processes.