4-Ethynyl-1,5-dimethyl-1H-pyrazole(CAS: 61514-54-3)

4-Ethynyl-1,5-dimethyl-1H-pyrazole (CAS: 61514-54-3) is a crystalline solid with a molecular weight of approximately 141.15 g/mol. It has a low solubility in water but is more soluble in organic solvents like dichloromethane and acetone. Chemically, it is reactive towards nucleophiles and can undergo substitution reactions. It is less reactive towards electrophiles but can participate in addition reactions due to its terminal ethynyl group.

4-Ethynyl-1,5-dimethyl-1H-pyrazole can be synthesized via a multistep approach. One common method involves the condensation of 1,5-dimethylpyrazole and acetylene in the presence of a suitable catalyst, such as Pd/C or a Lewis acid. The reaction typically provides a good yield of the target compound with high selectivity.

4-Ethynyl-1,5-dimethyl-1H-pyrazole (CAS: 61514-54-3) finds applications in the pharmaceutical industry for the synthesis of certain drugs. It is also used in the production of polymers and as a precursor in the development of sensors and semiconductors, where its unique electronic properties are exploited.

When handling 4-Ethynyl-1,5-dimethyl-1H-pyrazole (CAS: 61514-54-3), it is important to wear appropriate personal protective equipment (PPE), including gloves and safety goggles. The substance should be handled in a well-ventilated area or a fume hood to minimize exposure. Spills should be cleaned up carefully and according to safety data sheet (SDS) guidelines. Always refer to the SDS for detailed safety information.