Spiro[3.5]nonane-7-carboxylic acid is primarily utilized in organic synthesis as a building block for more complex molecules. Its unique spirocyclic structure makes it valuable in the development of pharmaceuticals, particularly in the design of drugs with specific stereochemical properties. The compound is often employed in the synthesis of bioactive molecules, including potential therapeutic agents targeting neurological disorders or inflammation. Additionally, it serves as a precursor in the creation of specialty chemicals and materials, such as polymers or ligands for catalysis, where its rigid framework can impart desirable properties to the final product.