4-bromo-1-nitroso-1H-pyrazole

4-bromo-1-nitroso-1H-pyrazole, also known as BNPP, is a chemical compound with the molecular formula C3H2BrN3O2. It is a yellow crystalline solid that is primarily used as a reagent in organic synthesis. BNPP is composed of a pyrazole ring with a bromine atom and a nitroso group attached to it. This structure makes it a versatile compound that can be used in a wide range of chemical reactions. One of the main uses of BNPP is as a building block in the synthesis of various nitrogen-containing organic compounds. It can be used to create pharmaceuticals, agrochemicals, and other specialty chemicals. BNPP is also used as a catalyst in certain chemical reactions, particularly in the synthesis of heterocyclic compounds. In terms of its chemical properties, BNPP is a relatively stable compound with a melting point of 174-176°C. It is soluble in organic solvents like acetone and dichloromethane, but is insoluble in water. BNPP is also sensitive to light and should be stored in a cool, dark place. Despite its usefulness in organic synthesis, BNPP can be hazardous to handle. It is classified as a hazardous substance by the European Union and may cause skin and eye irritation. Care should be taken when handling BNPP, and appropriate safety measures should be followed.