Praseodymium(III) iodide, ultra dry, is primarily used in the synthesis of organic compounds, particularly in catalytic processes where it acts as a Lewis acid to facilitate various chemical reactions. It is also employed in the preparation of praseodymium metal through reduction processes, which is essential for producing high-purity metals used in specialized alloys. Additionally, this compound finds application in research and development of advanced materials, such as phosphors and optical glasses, where its unique properties enhance performance in lighting and laser technologies. Its ultra-dry form ensures minimal moisture interference, making it suitable for sensitive applications in both industrial and laboratory settings.