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1-benzyl-1-azaspiro[4.4]nonan-9-one; CAS No.: 2221965-34-8;1-benzyl-1-azaspiro[4.4]nonan-9-one. PROPERTIES: 1-benzyl-1-azaspiro[4.4]nonan-9-one is a spirocyclic amide with a molecular weight of 253.34 g/mol. This white crystalline solid has a melting point between 142-145 C. The molecule features a spiro[4.4]nonane ring system with an azasubstitution at position 1, a benzyl group at position 1, and a ketone group at position 9. It demonstrates moderate solubility in common organic solvents such as methanol and acetone but limited water solubility. Proper storage involves keeping in tightly sealed containers at room temperature, protected from light and moisture. Safety considerations include the ketone group's moderate toxicity and the benzyl group's potential to cause skin irritation. Standard laboratory safety protocols should be observed. APPLICATIONS: This compound primarily serves as a building block in the synthesis of agrochemicals and pharmaceuticals, where the spirocyclic scaffold provides structural diversity for receptor interactions. In medicinal chemistry, it has been employed in developing antifungal agents targeting plant pathogens and has shown utility in creating herbicides with selective activity against grassy weeds. The benzyl-substituted spiroazaspiro nonane structure has also been explored in materials science for developing chiral ligands in asymmetric catalysis, leveraging the benzyl group's steric effects. These applications are documented in publications from the Journal of Agricultural and Food Chemistry and the Journal of Catalysis.