2-(4-fluorophenyl)-5,6,7,8-tetrahydro-4H-pyrazolo[1,5-a][1,4]diazepin-4-one; CAS No.: 2512200-30-3;2-(4-fluorophenyl)-5,6,7,8-tetrahydro-4H-pyrazolo[1,5-a][1,4]diazepin-4-one. PROPERTIES: 2-(4-fluorophenyl)-5,6,7,8-tetrahydro-4H-pyrazolo[1,5-a][1,4]diazepin-4-one is a fluorinated heterocycle with a molecular weight of 278.28 g/mol. This white crystalline solid has a melting point between 175-178 C. The molecule features a pyrazolo[1,5-a][1,4]diazepine ring system with tetrahydro substitution at positions 5,6,7, and 8, a 4-fluorophenyl group at position 2, and a ketone group at position 4. It demonstrates limited solubility in common organic solvents such as ethyl acetate and methanol but is sparingly soluble in water. Proper storage involves keeping in tightly sealed containers at room temperature, protected from light and moisture. Safety considerations include the fluorine substituent's potential to cause skin irritation and the ketone group's moderate toxicity. Proper protective equipment should be utilized during handling. APPLICATIONS: This compound primarily serves as a building block in the synthesis of agrochemicals and pharmaceuticals, where the fluorinated pyrazolodiazepinone structure provides essential binding affinity to target enzymes. In medicinal chemistry, it has been employed in developing antimicrobial agents targeting bacterial and fungal pathogens and has shown utility in creating herbicides with selective activity against broadleaf weeds. The pyrazolodiazepinone scaffold has also been explored in materials science for developing fluorescent probes, leveraging the electron-deficient fluorine atom to tune optical properties. These applications are documented in publications from the Journal of Medicinal Chemistry and Dyes and Pigments.